The correct answer for this question will be option D.
Calcium-41 = 3.12×[tex]10^8[/tex] atoms
Potassium-41 = 4.69×[tex]10^9[/tex] atoms
As stated in the question,
Half life of isotope of Ca-14 which decays into K-14 = 1.03 × [tex]10^5[/tex] years
Therefore, after 1.03 × [tex]10^5[/tex] years (1 half life)
Ca-41 will be 50%
and, K-41 will be 50%
After 2.06 × [tex]10^5[/tex] years (2 half lives)
Ca-41 will be 25%
K-41 will be 75%
After 3.09 × [tex]10^5[/tex] years (3 half lives)
Ca-41 will be 12.5%
K-41 will be 87.5%
After 4.12 × [tex]10^5[/tex] years (4 half lives)
Ca-41 will be 6.25%
K-41 will be 93.75%
After 4.12 × [tex]10^5[/tex] years,
Ca-41 = 6.25/100 × 5×[tex]10^9[/tex]
= 3.12 × [tex]10^8[/tex] atoms
K-41 = 93.75/100 × 5×[tex]10^9[/tex]
= 4.69 × [tex]10^9[/tex] atoms
Therefore, option D is correct.
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which of the following statements about the condition shown in the u-shaped tube are true?
The statements which are true about the condition shown in the u-shaped tube are:
There is less free water in the right arm of the tube than in the left arm of the tube.Water is tightly clustered around the hydrophilic solute molecules on both sides of the membrane.The correct answer choices are options a and b.
What is meant by U-shaped tube?
In the tube above, there is less free water in the right arm of the tube than in the left arm of the tube because the concentration of sugar is is lower in the right arm than in the left arm.
This is a tube whose shape is in U form and usually used contains either mecury or water to measure atmospheric pressure.
So therefore, the statements which are true about the condition shown in the u-shaped tube are:
There is less free water in the right arm of the tube than in the left arm of the tube.Water is tightly clustered around the hydrophilic solute molecules on both sides of the membraneComplete question:
Which of the following statements about the conditions shown in the U-shaped tube are true?
a. There is less free water in the right arm of the tube than in the left arm of the tube.
b. Water is tightly clustered around the hydrophilic solute molecules on both sides of the membrane.
c. There is more solute in the left arm of the tube than in the right arm.
d. Solute can pass through a selectively permeable membrane from right to left but free water cannot pass.
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Which scenario is most likely to occur by passive transport?
Responses
movement of large, non-polar molecules across the cell membrane against their concentration gradient
movement of large, non-polar molecules across the cell membrane against their concentration gradient
movement of large, polar molecules across the cell membrane with their concentration gradient
movement of large, polar molecules across the cell membrane with their concentration gradient
movement of small, non-polar molecules across the cell membrane with their concentration gradient
movement of small, non-polar molecules across the cell membrane with their concentration gradient
movement of small, polar molecules across the cell membrane against their concentration gradient
The scenario that is most likely to occur by Passive transport is the movement of small, non-polar molecules across the cell membrane with their concentration gradient. Thus, the correct option for this question is C.
What is Passive transport?Passive transport may be defined as a type of transport that significantly occurs along the concentration gradient without the use of metabolic energy. Passive transport is divided into two types, i.e. Simple diffusion and facilitated diffusion.
In simple diffusion, no transporters are needed and depend on the chemical gradient while facilitated diffusion is a carrier or transporters mediated diffusion which depends on the electrochemical gradient. The mechanism of passive transport is spontaneous i.e. no need for energy from outside.
Therefore, the correct option for this question is C.
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What is needed for an idea to be scientifically reliable?
A.
B.
C.
D.
E.
What is the scientific method?
What are the steps of the scientific method?
What are variables in an experiment?
Independent
Dependent
Control
What is the difference between science and pseudoscience?
What is a law?
What is a theory?
What is biology?
Answer: The six steps of the scientific method include: 1) asking a question about something you observe, 2) doing background research to learn what is already known about the topic, 3) constructing a hypothesis, 4) experimenting to test the hypothesis, 5) analyzing the data from the experiment and drawing conclusions
Explanation:
All of the following are correct, except:
A.When an object absorbs light waves, the energy is usually converted into thermal energy, causing the object to warm up.
B.When light travels through water, the red wavelengths are absorbed by the water first.
C.When an object appears black, it is because all of the colors of light are being reflected by that object.
D.When light does not bounce off or travel through a substance, it is absorbed by that substance.
Answer:
D. When an object appears black, it is because all of the colors of light are being reflected by that object.
Explanation:
The colors of light are not being reflected by the object but rather absorbed by the object.
I hope this is the answer you are looking for and I hope this helps!
QUESTION 17
The layer of the Earth in which most of the rocks and minerals will begin melting within is the:
OA. Asthenosphere
OB. Inner Core
OC. Lithosphere
OD. Mantle
OE. Outer Core
which snail species had a higher population in part one? which adaptations aided in their survival?
Answer:
it would be the Tasmanian snail
Explanation:
from the Brazilian forests they survived off the algy and moistness
PLS HELP!! WILL GIVE BRAINLIEST
Defining a system under study and making a model of it are tools for developing a better understanding of natural phenomena in science. Give an example of how system models are used by scientists to investigate natural and designed systems.
An ecosystem may be a system under study, where complex relationships between biotic factors (i.e., organisms) and abiotic factors (i.e., water, temperature, etc) help to understand the real world.
What are systems in sciences?A system in science such as, for example an ecosystem (which is an open system in nature), can be defined as a complex group of elements that need to be delimited to analyze how it may suffer modifications in a given period, which helps to understand properties of the system.
In conclusion, in disciplines such as biology, the term ecosystem is used to describe a system in which occurs complex associations between biotic factors and abiotic factors, and whose study may reveal important characteristics observed in the real world.
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Which of the
following is an example of a hydrogen bond?
a. The pentide bond between amino acids in a protein
b. The bond between an oxygen atom and a hydrogen in the carboxyl group of a fatty acid
c. The bond between Na* and Cl' in salt
d. The attraction between a hydrogen of one water molecule and the oxygen of another
water molecule
Answer: a
Explanation:
How did Rosalind Franklin’s work change the way we think about DNA? 3-4 sentences
Rosalind Franklin demonstrated that the molecule existed in a helical configuration and, more significantly, identified the density of DNA.
What was discovered by Rosalind Franklin's DNA experiment?It was developed by Rosalind Franklin using an approach called X-ray crystallography and showed the DNA molecule's helical structure.
Rosalind Franklin was a British scientist who is primarily remembered for her contribution to the understanding of DNA's structure. The use of X-ray diffraction was also pioneered by this remarkable woman. She overcame social and personal conflict to achieve one of science's most important discoveries.
Rosalind published her research in the scholarly magazine Nature in April 1953. James Watson and Francis Crick, two Cambridge physicists, revealed their double helix model of DNA in another article that appeared
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How many oxygen atoms are in the products of the following reaction? C6H12O6+6H2O+6O2→6CO2+12H2O
Answer:
24
Explanation:
count the oxygens right of the arrow… 6CO2 would have 12 oxygen atoms because CO2 has 2 and there are 6 of them. 12H2O has 12 because H2O has 1 oxygen atom. 12+12 = 24
Which of the following is NOT a macroscopic property of hair?
a. Length b. Types of scales on the medulla
c. Texture d. Thickness
Answer:
length. anyone can choose to have long hair
A viral outbreak in a city needs to be traced to its source. How can wastewater be used to trace the viral outbreak?
Viral outbreak could be traced through wastewater as follows-
New viral variations could be found when they first arise in a region using wastewater surveillance.
Data from clinical tests can be supplemented by wastewater monitoring, which offers an accurate overview of the kinds and quantities of viruses and bacteria proliferating in a community. Cost-effective since a single wastewater sample provides a significant quantity of information about an entire building, town, or county.
In both untreated and treated wastewater as well as in receiving water bodies, viruses are pervasive and persistent.
Human feces, especially that from diseased people, is one of the major sources of viruses, including viral diseases, in wastewater.
Enteric viruses are discharged by sick people into sewage systems. Per gram of feces, an infected person excretes 10∧5 to 10∧12 virus particles.
It has been demonstrated that the prevalence and diversity of harmful viruses in wastewater resemble the distribution of infections among humans.
Hence, in this way viruses can be detected in waste water.
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Besides the R group, what other two types of functional groups are always found in an amino acid?
Answer:
Carboxyl group and Amino Group
Explanation:
Hope this helps.
All of the following statements are true about STI'S EXCEPT:
A. Hepatitis B can cause jaundice.
B. Syphilis affects the brain and central nervous system.
C. Using a condom can protect against all STI's.
D. Gonorrhea and chlamydia can be successfully treated with antibiotics.
Answer:
A.Hepatitis B ca cause jaundice
HELP ME PLS
Think about the role of both biotic and abiotic factors within an ecosystem.
Describe a scenario in which one abiotic or biotic factor is added or removed from an ecosystem.
Explain the possible side effects on that ecosystem.
Be sure to –Address the prompt, provide support, and conclude your thoughts.
Deforestation may lead to the loss of fundamental producer organisms (biotic factors) in the ecosystem, while drought conditions (abiotic factors) may also alter the equilibrium of the ecosystem.
What are biotic factors and abiotic factors?Biotic factors are presented by all organisms that form a community living in a particular ecosystem, while abiotic factors are all conditions (e.g., temperature, water availability, etc) that shape the structure of the ecosystem by interacting with the community.
In conclusion, deforestation may lead to the loss of fundamental producer organisms (biotic factors) in the ecosystem, while drought conditions (abiotic factors) may also alter the equilibrium of the ecosystem.
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How are humans and animals directly or indirectly dependent on plants?
Answer:
thanks for your question.
human and animal are directly or indirectly dependent on plants .The reason is very clear. look that, to alive human and animal needs oxygen which is very important for our and animal life. We can't live without it. And this important things are come from plants. By taking carbon-dioxide and suns light from our environment they makes the important things which is oxygen. Without they also gives us fruit, food and protection from natural disaster
Explanation:
that's why human and animal are directly or indirectly dependent on plants
If the difference between the wet-bulb and the dry-bulb temperature is 4 and the dry-bulb temperature is 14, what is the dew point temperature?
The dew point temperature is 6°C when the difference between wet-bulb and dry-bulb temperatures is 4°C and the dry-bulb temperature is 14°C.
To calculate the dew point temperature, a table is used instead of a formula. To determine the dew point temperature the dry-bulb temperature (which is 14°C in this case) on the left side of the table is noted and then the difference between wet-bulb and dry-bulb temperatures, i.e. 4°C is noted given on the top of the table. Now the cell where these row and column meet gives the value of the dew point temperature, which comes out to be 6°C.
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Which of the following is TRUE of the transmission of neural signals?
Signals are transmitted from the dendrites of the presynaptic neuron to the axons of the postsynaptic neuron.
Action potentials are transmitted across synapses by neurotransmitters.
Synaptic vesicles are extensions of the dendrites that receive information.
The strength of an action potential is related to the strength of incoming signals.
Explanation:
single neuron, or nerve cell, can do a lot! It can maintain a resting potential—voltage across the membrane. It can fire nerve impulses, or action potentials. And it can carry out the metabolic processes required to stay alive.
A neuron’s signaling, however, is much more exciting—no pun intended!—when we consider its interactions with other neurons. Individual neurons make connections to target neurons and stimulate or inhibit their activity, forming circuits that can process incoming information and carry out a response.
How do neurons "talk" to one another? The action happens at the synapse, the point of communication between two neurons or between a neuron and a target cell, like a muscle or a gland. At the synapse, the firing of an action potential in one neuron—the presynaptic, or sending, neuron—causes the transmission of a signal to another neuron—the postsynaptic, or receiving, neuron—making the postsynaptic neuron either more or less likely to fire its own action potential.
Schematic of synaptic transmission. An action potential travels down the axon of the pre-synaptic—sending—cell and arrives at the axon terminal. The axon terminal is adjacent to the dendrite of the post-synaptic—receiving—cell. This spot of close connection between axon and dendrite is the synapse.
Schematic of synaptic transmission. An action potential travels down the axon of the pre-synaptic—sending—cell and arrives at the axon terminal. The axon terminal is adjacent to the dendrite of the post-synaptic—receiving—cell. This spot of close connection between axon and dendrite is the synapse.
In this article, we'll take a closer look at the synapse and the mechanisms neurons use to send signals across it. To get the most out of this article, you may want to learn about neuron structure and action potentials first.
Electrical or chemical transmission?
At the end of the 19th and beginning of the 20th century, there was a lot of controversy about whether synaptic transmission was electrical or chemical.
Some people thought that signaling across a synapse involved the flow of ions directly from one neuron into another—electrical transmission.
Other people thought it depended on the release of a chemical from one neuron, causing a response in the receiving neuron—chemical transmission.
We now know that synaptic transmission can be either electrical or chemical—in some cases, both at the same synapse!
Chemical transmission is more common, and more complicated, than electrical transmission. So, let's take a look at chemical transmission first.
Overview of transmission at chemical synapses
Chemical transmission involves release of chemical messengers known as neurotransmitters. Neurotransmitters carry information from the pre-synaptic—sending—neuron to the post-synaptic—receiving—cell.
As you may remember from the article on neuron structure and function, synapses are usually formed between nerve terminals—axon terminals—on the sending neuron and the cell body or dendrites of the receiving neuron.
Schematic of synaptic transmission. An action potential travels down the axon of the presynaptic—sending—cell and arrives at multiple axon terminals branching off from the axon. The axon terminal is adjacent to the dendrite of the postsynaptic—receiving—cell. This spot of close connection between axon and dendrite is the synapse.
The Phanerozoic eon has three eras. Match each era with the appropriate characteristic or event.
1. Paleozoic era
2. Mesozoic era
3. Cenozoic era
time of the dinosaurs
largest mass extinction in Earth's
history
sometimes called "Age of
Mammals"
1. Paleozoic Era ⇒ largest mass extinction in Earth's
history
2. Mesozoic era ⇒time of the dinosaurs
3. Cenozoic era ⇒sometimes called "Age of
Mammals"
Three eras—the Paleozoic, Mesozoic, and Cenozoic eras—make up the Phanerozoic Eon.
The Paleozoic Era is known as the era of "ancient life." Six distinct stages were split between 544 and 245 million years ago (see the Figure below). The beginning of the era was marked by a magnificent surge of new life. It's called the Cambrian explosion. The end of the time period was marked by the biggest mass extinction the planet has ever seen.During the Mesozoic, or "Middle Life," era, the Earth was home to huge species such as dinosaurs, giant reptiles, and other creatures. It spanned 252 million years ago to roughly 66 million years ago and was also known as the age of reptiles or the age of dinosaurs.Because animals were the largest during the Cenozoic era, it is known as the "age of mammals."To learn more about Phanerozoic era refer- https://brainly.com/question/996147
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4. Twenty percent of the air breathed in consists of oxygen. Sixteen percent of the amount of oxygen entering air breathed out, consists of oxygen .Catulate the blood per breath after running.
The air that is breathed in contains oxygen in a concentration of 20% while the air exhaled still contains oxygen in a concentration of 16%. This implies 4% oxygen has been absorbed by the blood cells per breath.
Even though 16% of the oxygen in the air is exhaled, hemoglobin is 100% saturated with oxygen.We only exhale 16% of the oxygen we breathe in because some parts of our lungs are not actively engaged in gas exchange.The conducting parts of the airways that do not take part in the exchange of oxygen and carbon dioxide include the nose, mouth, and windpipe, for instance. They only move air from the atmosphere to the interior of the lungs. The distal-most air sacs, known as the alveoli, where gas exchange takes place, are the functioning parts of the lungs.Therefore, the air from the nose, mouth, and windpipe still contains all of the oxygen when we exhale, and this accounts for the 16% of oxygen that is lost during breathing.
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Imagine you are visiting a museum display of an ancient civilization and you study the artifacts shown in photograph. Which of the following is the best conclusion to draw about the civilization?
Group of answer choices
A) There were large animals in the area for the people to hunt for food.
B) There was little access to trees and metal products in the area.
C) The people in the civilization lived in very small groups.
D) The people in the civilization were not skilled with their hands.
Answer:c
Explanation:
The influenza virus comes in different forms. Type A influenza can have slightly different protein
structures, which may confuse our immune systems. The slightly different proteins are produced by the
accumulation of mutations in the genes that code for these particular proteins.
During an earthquake a small group of deer are separated from their herd. A long distance away
a.genetic drift
b. gene flow
c. mutation
d. recombination
Answer:
the anserw A genetic drift
A cell's interior is considered isotonic to the surrounding fluid when:
Answer: When the solute concentrations are the same within and outside the cell.
Explanation: Isotonic is when the osmotic pressure is the same in one solution as another. In this case, on the outside and inside of the cell.
HELP PLEASE DUE SOON! QUESTION BELOW! IM SO CONFUSED I DONT EVEN KNOW WHERE TO START!
The poem illustrating the effect of the sympathetic nervous system and the parasympathetic nervous system on Sally is:
My heart races like a sprinterEvery time my eyes sets on himBe calm I pray you little sisterOne day you'll wake from this dreamWhat is the nervous system?The nervous system is the system of the body that controls how the body receives, processes and transmit information to the different part of the body.
The nervous system can be said to be the control center of the body.
The sympathetic nervous system and the parasympathetic nervous system are parts of the peripheral nervous system which have opposing effects.
The sympathetic nervous system keeps the body alert by activating the body's “fight-or-flight” response. The hearts beats faster, the respiratory rate increases, and the pupils dilate.
The parasympathetic nervous system relaxes the body after periods of stress or danger. The hearts beat normal, the respiratory rate normalizes, and the pupils constrict.
In conclusion, the sympathetic nervous system and the parasympathetic nervous system have antagonistic effects.
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2) TRUE or FALSE: If everyone in a neighborhood applies fertilizer to their lawn, they could fall into
The Tragedy of the Commons. (Remember fertilizer pollutes waterways and can harm fish and other
wildlife)
If everyone in a neighborhood applies fertilizer to their lawn, they could fall into The Tragedy of the Commons. TRUE
The tragedy of the commons is an economic problem of over-consumption, under-investment, and ultimately depletion of common resources. The tragedy of the commons is a situation in which individual users who have free access to resources are not constrained by shared social structures or formal rules governing access.
The tragedy of the commons is caused by externalities. When family herds graze on common land, the quality of land available to other families is reduced. Humans ignore this negative externality when deciding how many sheep to own, resulting in an overabundance of sheep. Fertilization can affect the accumulation of heavy metals in soil and plant systems. Plants can absorb fertilizer through the soil and enter the food chain.
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Many species of mushroom look similar. One way to identify mushrooms is by their spore print. Mushroom hunters set the cap from a mature mushroom on a piece of paper or aluminum foil. Over the next few hours, spores fall out of the mushroom, making a spore print. Both the color and the pattern of the spore print help to identify the species of mushroom.
The correct words to complete the sentence, and the completed sentence are; Mushrooms are fungi that use spores for reproduction.
What are fungi?Fungi is a kingdom made up of a group of organisms that include molds, yeasts, and fungi. They are heterotrophic organisms that have cell walls. Fungi cannot form their own nutrients so they live as parasites on the plants and animals around them. The fungi that form in humans can coexist in these without causing any infection, but some can produce them. Fungi can reproduce using spores and disperse until they find favorable conditions to germinate.
Therefore, we can confirm that mushrooms are fungi that use spores for reproduction.
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The complete question states:
Many species of mushrooms look similar. One way to identify mushrooms is by their spore print. Mushroom hunters set the cap from a mature mushroom on a piece of paper or aluminum foil. Over the next few hours, spores fall out of the mushroom, making a spore print like the ones pictured. Both the color and the pattern of the spore print help to identify the species of mushroom. Choose one word from the first column and one word from the second column that correctly completes the sentence.
Mushrooms are ____________________ that use spores for ______________________.
Bacteria
Reproduction
Fungi
Waste
Elimination
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Describe Claire’s symptoms. Explain how they were related to metabolism and homeostasis.
Claire's symptoms indicate that she has recently stopped enjoying her employment, which she used to really enjoy because of her impaired vision.
What impact of homeostasis on metabolism?The process of metabolism helps an organism's body and cells stay healthy by involving different chemical reactions that aid in obtaining, storing, and using energy.
All the ongoing chemical reactions inside your body that support life and regular function are referred to as metabolism (maintaining normal functioning in the body is called homeostasis)
Homeostasis and metabolism are interconnected because both are necessary for efficient metabolism and for the maintenance of homeostasis.
In order for metabolism to function effectively, homeostasis must exist. Additionally, one method the body maintains homeostasis is through efficient metabolism.
Therefore, Metabolism and homeostasis are related to each other.
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i need help how to hide 15 bodies
Answer: Big hole in backyard
Explanation: dig big hole in backyard, put bodies in said hole, and put a few deer in hole so it will cover the smell from police dogs if police is called on you.
Answer: should i call the cops
Explanation:
Which is the order of these biological objects from least complex to more complex?
The order of these biological objects from least complex to more complex is R, Q, T, S (option A).
How are organisms arranged hierarchically?Living organisms are made up of building blocks. The level of organization of life is the hierarchical arrangement of components that make up living organisms.
The hierarchical level of organization in the ascending order i.e. simplest to most complex is as follows:
OrganellesCells TissuesOrgansOrgan systemsOrganismsAccording to this question, these components are assigned letters/alphabets that are represented as follows:
Q - cellR - organelleS - multicellular organismT - organTherefore, the order of these biological objects from least complex to more complex is R, Q, T, S.
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Which of the following statements is TRUE?
A. When muscles contract they become longer.
B. Involuntary muscle can be identified by its unique striped appearance.
C. The biceps and quadriceps are an antagonistic pair.
D. The origin of a muscle is attached to the bone that does NOT move.
"The origin of a muscle is attached to the bone that does NOT move" is true among the following statements.
The origin and insertion of an attachment are the points of attachment. When a muscle contracts, the point of attachment known as the origin remains stationary. As a result, when contraction occurs, the origin bone is the more immobile of the two bones at the joint.
Skeletal muscles have two or more points of attachment to bone, or occasionally to other muscles or tissues. The attachment is said to as having an origin if the location is a bone that is stationary during an action. The attachment is referred to be an insertion if the location is on the bone that moves during the motion.
The triceps brachii has four places of attachment: three origins and one insertion on the ulna (two on the humerus and one on the scapula).
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