Answer:
Day time period have we as humans been here: 26 seconds
Explanation:
4,500,000,000 years = 1 day
1,400,000 years = X
X = 0.0003111
1 day = 86,400 seconds
0.0003111 = X
X = 26 seconds
In term of the Earth in 24-hour clock, Homo sapiens appeared on our planet only in the last 26 seconds, it means that in geologic time, humans have existed for only a brief time period and thereby it is a relatively new species.
What do eukaryotes cells have that prokaryotes do not have
Answer:
Prokaryotic cells are less structured than eukaryotic cells. They have no nucleus; instead their genetic material is free-floating within the cell. They also lack the many membrane-bound organelles found in eukaryotic cells. Thus, prokaryotes have no mitochondria. I hope this helped.
IF YOU DO NOT MIND CAN YOU MARK ME BRAINLIEST?Answer:
true cell
Explanation:
membrane bound organelles such as the nucleus
What happens during G2 phase?
Answer:
Gap 2 (G2): During the gap between DNA synthesis and mitosis, the cell will continue to grow and produce new proteins.
Answer provided by CELLS Alive
Conduct research to find something interesting that proves protists are necessary.
Answer:
The slime molds are important to ecosystems because they act as decomposers which will release nutrients back into the environment. Earth basically depends on protists because they supply oxygen and are critical in the food chain.
What are compounds called that form H+ ions when dissolved in water?
Answer:
Acid
At the simplest definition, an acid is any compound that yields hydrogen ions (H +) or hydronium ions (H 3O +) when dissolved in water. Hydronium ions are really the combination of H + ions and H 2O molecules
Explanation:
how much is 300000 *
Answer:
300,000
Explanation:
It is 30% of a million and quite a bit of money that can be used to buy a house.
Answer:
300000
Explanation:
lol easyyy
Animals and dogs Plants absorb ____ from the atmosphere through _____
ASAP PLEASE
1. oxygen
2. nose and roots
In experiment #2 you are asked to use the scientific method to develop and execute a method of separating a mixture of sand, salt and iron pellets. Imagine you are in a lab and notice that a plate of bacteria grow faster in the presence of sunlight. After that single observation, you come to the conclusion that sunlight causes bacteria to grow fast. What would be the next step in the scientific method for this experiment?
Answer:
1. separation can be done with help of magnetic bar and filtration.
2. the next step will be testing the hypothesis.
Explanation:
1. Separation of iron pellets from sand, and salt first
Use a magnet
Due to magnetic force iron pallets will attach with it and separation will occur from sand and salt.
After separation of iron pallets, add water to mixture of sand and salt and heat until salt get dissolved then filter the salt water.
This will help in separating all three components of mixture to separate.
2. Bacteria growth
Hypothesis must be tested-
In this case a hypothesis and conclusion is represented. Conclusion is provided that in presence of sunlight growth of bacteria is faster. So the hypothesis must be verified by scientific experiment to be a valid theory by measuring or monitoring growth in presence of sunlight.
What happens to grasslands and wetlands as forests are used up?
Answer:
they dry
Explanation:
because forests are sources of rain and without rain wetlands can't have water and grass can't grow n grassland
Answer:
they become really dry good luck men
Which macromolecule is made up of nucleic acids ?
A. Sucrose
B. RNA
C. Fatty Acids
D. Protein
Answer:
Ribonucleic acid (RNA)
Explanation:
DNA (deoxyribonucleic corrosive) is the most widely recognized type of hereditary material found in numerous living beings.
Nucleic acids connect the two strands of the DNA double helix together.
RNA (ribonucleic corrosive) is additionally found as genetic material (and not DNA) in certain creatures like infections.
Infections could have ssRNA (single-stranded RNA) or dsRNA (double-stranded RNA) as their hereditary material.
However, RNA is generally single-stranded, in contrast to DNA, which is double-stranded consistently.
Another type of RNA is messenger RNA (mRNA), ribosomal RNA (rRNA), transfer RNA (tRNA), etc
The stimulus interval has a profound effect on the contraction force of the muscle. In your own words explain what happened when the muscle was stimulated in rapid succession. At which interval did the volunteer's muscle twitches begin to merge together (summate)
Answer:
The skeletal muscle is stimulated by means of action potentials that are caused by the neuromotor plate. These action potentials are one after the other and can become cumulative once the muscle fibers pass the refractory phase of the action potential.
The refractory stage is that stage in which action potentials are not admitted, therefore where the muscle fibers do not accept stimuli to contract.
Once this refractory stage is over, more action potentials can be admitted, which would be summative and the muscle fiber would contract with greater power.
Explanation:
If a muscle is repeatedly stimulated, the contraction will be weaker or the muscle will fatigue more easily, triggering muscle failure.
If the muscle is stimulated with a longer pause between contraction and contraction, the action will be performed with more power.
Why do sex-linked traits follow different patterns of inheratance than other traits
Answer:
Males and females have different sex chromosomes.
Explanation:
Sex Linked trait is controlled by the chromosomes while other traits are controlled by autosomes. The autosomal cells and traits have a constant characteristics in a human being. The chromosomal cells however vary. The male chromosome XY is different from the female chromosome XX.
This is the reason why sex-linked traits follow different patterns of inheratance than other traits as a result of the Males and females having different sex chromosomes is valid.
list and explain the three classes of enzymes
Answer:
Oxidoreductases, transferases and hydrolases are the most abundant forms of enzymes.
Explanation:
The fruit fly Drosophila melanogaster is an important model system for studying inheritance in animals and genetic control of animal development, including humans. Evaluate Drosophila as a model system for human biology. What are their strengths and weaknesses as a model system? g
Answer:
The correct answer is "strengths: inexpensive, easy to culture, short life cycle, large number of offspring; weaknesses: invertebrate model, some diseases such as immunological cannot be modelled, anatomical features are very different from humans"
Explanation:
The fruit fly Drosophila melanogaster is one of the most used animal model for genetic and biomedical studies. There are many advantages of using Drosophila as model, including that it is very inexpensive to handle, it is easy to culture, it has a short life cycle allowing to observe the changes in phenotype very quickly and its large number of offspring allows to include several repetitions per trait in a study. However, there are some weaknesses of using Drosophila to study human biology. First, obviously the fruit fly is very different from humans, it is an invertebrate and its anatomical features are very different, which makes impossible to model some disorders such as immunological diseases.
What happens to certain nutrient molecules after they pass into muscle cells?
A.
They are replicated in the nucleus
B.
They are acted on by enzymes and release the energy they contain.
c.
They are changed into tissues and organs in the cytoplasm.
D.
They enter chloroplasts, where they can absorb light energy.
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Answer:
B. They are acted on by enzymes and release the energy they contain.
Explanation:
Muscles need energy to function thus these molecules make their way into muscles where enzymes act on them to release the energy, energy will likely be ATP.
Given two types of starfish, gold ones and purple ones, that are members of the same species. In your sample area, there are 325 gold starfish and 150 purple starfish (assume purple is dominant)
A. Find the genotype frequencies for "SS", "Ss", & "ss"
B. Find the allele frequencies for "S" (p) & "s" (q)
Answer: I believe I can fly
Explanation:
I believe I can touch the sky.
JK Love you bae
After a polypeptide chain has been synthesized, certain amino acids in the peptide may become modified. For each modified amino acid, identify the standard amino acid from which it is derived. Enter the unabbreviated name of the standard amino acid.
Answer:
Lysine
Explanation:
Lysine is a unabbreviated name of amino acid. It is used in biosynthesis of proteins. It contains [tex]\alpha[/tex]-amino group and [tex]\alpha[/tex]-carboxylic acid group which has formula is C6H14N2O2. Lysine is also considered as building block of amino acid. It is used for treating cold sores and can be applied directly to the skin.
Which of these factors will affect the friction on a road?
a) Oil
b) Water
c) Ice
d) all of the above
Answer:
all of the above
Explanation:
Oil,Water and Ice
all of these will affect the friction on the road.
hope this helps
brainliest appreciated
good luck! have a nice day!
Answer:
D-all of the above
Explanation:
Force of friction is the force which opposes the motion of an object over a surface
The force of friction acts between the object and the surface.
A ball rolling on ground gradually slows down and comes to rest due to force of friction between the ball and the ground.If we stop pedaling a bicycle, it gradually slows down and comes to a stop due to force of friction between the wheel and the road.Shortly after a stream dried up, you noticed a change in the field mouse population coat color variation. When the stream was flowing, there were two populations, one with darker coats and one with lighter coats. After the stream dried up, mice with darker coats were being born into the lighter coat population and vice versa.
a. True
b. False
Answer:
a. True
Explanation:
When the stream dried up darker coat mice were seen into the lighter coat population and vice versa because of the natural selection process.
Mice change their coat color by adapting the changes in the stream flow and evolve their coat either dark or light that provides camouflage so predators won’t see them and they are able to survive in the environment. Mice have the advantage of surviving long and they are able to pass their genes to the offspring.
Hence, the given statement is true.
3. What is the name of the process by which evolution occurs?
Answer:
Evolution is the process of genetic change from one generation to the next and may be caused by several methods. In essence, evolution occurs when some individuals or some alleles (gene types) reproduce themselves more than others,increasing their prevalence in subsequent generations.
Explanation:
The best experimental design:______
a. alters only one condition between the controls and the experimental condition
b. includes a large sample size for each condition
c. includes a control
Answer:
The correct answer is option d. "includes a large sample size and a control, and alters only one condition between the controls and the experimental condition".
Explanation:
The correct answer for this question is missing, which is option d. "includes a large sample size and a control, and alters only one condition between the controls and the experimental condition". The best experimental design includes all the options proposed: it includes a large sample size to ensure that the data is statistically relevant; a control to verify that the results are valid and are not obtained from other untested conditions; and it alters only one condition at the time to ensure the existence of the relation between condition and results.
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Introduction to Biology: Mastery Test
5
A student notices that when bananas are kept near other fruits, the other fruits ripen faster. She wonders what causes
more quickly and thinks that bananas must have an influence on the ripening process. She decides to perform an expe
bananas and apples and places an apple by itself at location A and an apple next to a banana at location B. She then w.
records the how ripe each apple is.
What would be the next step in this experiment?
O A
ask questions and construct a hypothesis
B.
make observations and draw a conclusion
O c.
construct a hypothesis and record data
D.
analyze the results and make a conclusion
Answer:
Explanation:
The next step in this experiment is constructing a hypothesis and recording data. The correct option is (C).
Making observations and keeping track of data would be the experiment's next phase. The learner would observe and record the ripening of both apples at locations A and B in this stage. They would have to keep track of the maturity of the apples throughout time by routinely observing and recording the changes. This could entail examining the apples visually for color, texture, and overall maturity and recording any variations between the apples at locations A (by themselves) and B (next to a banana).
The student can analyze the results and develop conclusions regarding the impact of bananas on the maturity of other fruits by gathering information on the ripening of the apples in both locations. The information can be used to prove or disprove the initial theory and assist determine whether bananas actually influence the maturity of surrounding fruits.
Hence, the correct option is (C). Construct a hypothesis and record data.
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What hormones are produced by the anterior pituitary?
Answer:
The following hormones are secreted
Explanation:
Adrenocorticotrophic hormone (ACTH)
Thyroid-stimulating hormone (TSH)
Luteinising hormone (LH)
Follicle-stimulating hormone (FSH)
Prolactin (PRL)
Growth hormone (GH)
Melanocyte-stimulating hormone (MSH)
ASAP PLEASEEE HELP ME
Remember monomers and polymers? DNA is what type of polymer?
A.) Protein
B.) Nucleic Acid
C.) Lipid
D.) Carbohydrate
Answer:
polynucleotide "carbon" sugar so I would say B or D
Explanation:
If you have a concern about fluoride in your drinking water, how do you get more information?
Answer:
Contact the Centers for Disease Control and Prevention (CDC).
Explanation:
What are the characteristics of erythrocytes? Erythrocytes contain a nucleus, mitochondria, and ribosomes. Erythrocytes synthesize proteins. Erythrocytes can change shape to squeeze through microcirculation. Erythrocyte proliferation is stimulated by erythrocyte colony-stimulating factor (E-CSF).
Answer:
Erythrocytes can change shape to squeeze through microcirculation.
Explanation:
Deformability is the ability of the red blood cells to change shape so as to enable them squeeze through tight or small spaces including capillaries.
Examination of a sandstone outcrop reveals an abundance of feldspar and quartz grains. Could this weathered material have come from a nearby basaltic lava flow or a granite outcrop up the road?
The weathered material of a sandstone outcrop revealing an abundance of feldspar and quartz grains would have come from a granite outcrop up the road rather than a nearby basaltic lava flow.
Feldspar is a common mineral found in granite, whereas it is less abundant or absent in basaltic lava flows. Granite is composed primarily of feldspar along with quartz and other minerals. So, the presence of an abundance of feldspar grains suggests a connection to granite rather than basalt.
Quartz is present in both granite and basalt, but it is more commonly associated with granite. Quartz is one of the major constituents of granite, whereas it is generally less abundant in basaltic lava flows. Therefore, the presence of quartz grains does not necessarily differentiate between the two sources but aligns more with the possibility of granite as the origin.
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Which one ?!!!?!?!?!?!?
Answer:B
Explanation: Mosses are small and usually spreads on the ground like mats thereby avoid direct exposure to sunlight. Palm tree on the other are large and usually grow very tall, hence are expose to maximum sunlight
Examples of stimulants include
a. Nicotine
b. Ecstasy
c. Dextromethorphan
d. A and B
Answer:
The answer to this question is d(A and B)
Explanation:
Hope this helps
Answer:
d but also c !
Explanation:
A and B are correct but also dextromethorphan has lower doses of stimulants
The human body’s nervous system is made up of?
Answer:
The central nervous system is made up of the brain and spinal cord.
If the current trend continues, can the temperature be expected to increase/decrease or stay the same in the next twenty years? Anssssswer please only 8 minutes left !!!
Answer:
Increase
Explanation:
