Answer:
about 3.7 billion years
The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.
Explanation:
hope it will help you
First part science pls help
Answer:
I am pretty sure its ribosome
Explanation:
if it's right please give me a heart hope it helps
Answer:
lysome
Explanation:
I am sure of that answer
What are the 4 principles of natural selection?
Which statement correctly describes the bonding between water molecules? A. The hydrogen atoms have a partial positive charge and are attracted to the oxygen atom in another molecule, which has a partial negative charge. B. The hydrogen atoms have a partial negative charge and are covalently bonded to the oxygen atom in another molecule, which has a partial negative charge. C. The hydrogen atoms have a partial positive charge and are covalently bonded to the oxygen atoms in another molecule, which have a partial negative charge. D. The hydrogen atoms have a partial negative charge and are attracted to the oxygen atom in another molecule, which has a partial negative charge.
Answer:
A. The hydrogen atoms have a partial positive charge and are attracted to the oxygen atom in another molecule, which has a partial negative charge.
Explanation:
I just took the quiz. That was the correct answer.
The hydrogen atoms have a partial positive charge and are attracted to the oxygen atom in another molecule, which has a partial negative charge. The correct option is A.
What is a hydrogen bond?A hydrogen bond or H-bond is an electrostatic attraction between a hydrogen atom covalently bound to a more electronegative "donor" atom or group.
Another electronegative atom weighing down a lone pair of electrons the hydrogen bond acceptor.
Since the electron is not shared evenly between a hydrogen atom and a negatively charged atom, hydrogen bonding occurs.
Hydrogen in a bond still has one electron, whereas a stable electron pair requires two electrons.
Hydrogen bonds form between adjoining hydrogen and oxygen atoms of adjacent water molecules in the case of water. A hydrogen bond is formed by the attraction of individual water molecules.
Thus, the correct option is A.
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This is due in exactly 15 minutes! I need help please ASAP!
5. Describe prokaryotic cells. Include general characteristics and indicate the one feature that eukaryotic cells have that the prokaryotic cells do not.
Answer: Prokaryotic cells lack a nucleus and membrane-bound structures. Eukaryotic cells have a nucleus and membrane-bound structures called organelles.
Hope this helps :)
The production of insulin, which is used to treat people with diabetes, is done by using bacteria. The gene for insulin is inserted into the genetic code of the bacteria. The bacteria then produce insulin in the same way as other materials. Which explanation describes one reason why bacteria are able to produce insulin?
a. All organisms produce insulin
b. Insulin is found only in humans.
c. Bacteria replicate all genes continuously
d. Bacteria and humans use comparable nucleotides in genes.
Answer:
Explanation:
c. Bacteria replicate all genes continuously
A person invested \$6,000$6,000 in an account growing at a rate allowing the money to double every 11 years. How much money would be in the account after 19 years, to the nearest dollar?
Answer: $19,866
Explanation:
We know that the initial investment is $6,000. And it doubles every 11 years.
Then after 11 years, the amount of money will be 2*$6,000
After another 11 years (a total of 22) the amount of money will be 2*(2*$6,000)
or $6,000*(2)^2
We already can see that this is an exponential growth equation.
After n times 11 years, the amount of money will be;
M = $6,000*(2)^n
But n represents groups of 11 years, then if y represents the number of single years, we can write the equation as:
M = $6,000*(2)^(y/11)
You can see that y = 11 is equivalent to n = 1
y = 22 is equivalent to n = 2
and so on.
Then the equation:
M = $6,000*(2)^(y/11)
Tell us how much money will be in the account after y years.
Now we only need to replace y by 19, to get:
M = $6,000*(2)^(19/11) = $19,866
Where i rounded the amount of money to the nearest dollar.
Someone help me match the last two with their definition?
Diffusion and facilitated diffusion
Answer:
Explanation:
3. diffusion
4. facilitated diffusion
Space exploration has advanced our knowledge of the universe. Which space journey would take the longest?
A. A journey from Earth to the Sun.
B. A journey from Earth to the Moon.
C. A journey from Earth to the nearest galaxy to the Milky Way.
D. A journey from Earth to the farthest planet in our solar system.
Answer:
a journey from earth to the nearest galaxy in milky way
Answer:
A journey from Earth to the nearest galaxy
Explanation:
My big brain
What several ways in which invasive species can be introduced? (intentionally or unintentionally).
Answer: Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. An invasive species can be introduced to a new area via the ballast water of oceangoing ships, intentional and accidental releases of aquaculture species, aquarium specimens or bait, and other means.
Metano (CH4) puede regresar a la atmosfera como dioxido de carbono a traves del proceso de? Porfa ayuden es un examen >.
Answer:
Combustión
Explanation:
La combustión es el proceso mediante el cual la materia reacciona con el oxígeno y se convierte en dióxido de carbono y agua.
Otro nombre para la combustión es quema. Cuando el metano se quema en el aire, se convierte en dióxido de carbono y se devuelve a la atmósfera según la reacción;
CH4 (g) + 2O2 (g) -----> CO2 (g) + 2H2O (g)
What do chloroplasts and mitochondria have in common?
absorption of light energy
production of ATP
digestion of cell wastes
presence in all cells
can anyone help me with this question?
how do enzymes affect activation energy in a chemical reaction
Answer:
Enzymes lower the activation energy that is needed, making reactions happen at a lower temperature that they could without the enzyme. This speeds up the rate of reaction.
Explanation:
Answer:
they speed up the chemical reaction
the digestive system is responsible for breaking down food into usable nutrients for the body, which other organ system works with the digestive system to transport nutrients to all the muscles, organs, and cells in the body?
Answer:
Circulatory System
Explanation:
As soon as 5he digestive system has broken down the foods to their smallest unit, the circulatory system helps to move the nutrient to where they are needed.
Blood is a medium of transport in higher vertebrates and is being pumped by the heart and flows through network of capillaries. Blood also transport oxygen that helps in the breakdown of carbohydrates to produce energy and get rid of waste such as carbondioxide through the excretory system.
In a codon which of the nucleotides tends to be less important for determining the corresponding amino acid and why
Answer:
el sapo
Explanation:
Since many proteins share the same first two bases, the third base is the least important.
What is codon?A codon is a three-nucleotide (DNA or RNA) sequence that forms a unit of genomic information encoding a specific amino acid or signaling the end of protein synthesis (stop signals).
There are 64 different codons, 61 of which specify amino acids and three of which serve as stop signals.
As a result of genetic code degeneracy, many amino acids share the third base and differ only in the first two bases, making the third base less important.
Stop codons are base triplets that do not code for amino acids; there are three stop codons: TAG, TAA, and TGA.
Thus, these tends to be less important for determining the corresponding amino acid.
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The Last Supper, also called the Lord's Supper, was originally the Passover.
A).True
B).False
Answer:
f
Explanation:
Answer:
(A) True
Explanation:
what is an important effect of mars low temperature and low air pressure
Standing on the ground and looking up, you are looking through the atmosphere. It might not look like anything is there, especially if there are no clouds in the sky. But what you don’t see is air – lots of it. We live at the bottom of the atmosphere, and the weight of all the air above us is called air pressure. Above every square inch on the surface of the Earth is 14.7 pounds of air. That means air exerts 14.7 pounds per square inch (psi) of pressure at Earth’s surface. High in the atmosphere, air pressure decreases. With fewer air molecules above, there is less pressure from the weight of the air above.
Pressure varies from day to day at the Earth’s surface - the bottom of the atmosphere. This is, in part, because the Earth is not equally heated by the Sun. Areas where the air is warmed often have lower pressure because the warm air rises. These areas are called low pressure systems. Places where the air pressure is high, are called high pressure systems.
A low pressure system has lower pressure at its center than the areas around it. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. As the air rises, the water vapor within it condenses, forming clouds and often precipitation. Because of Earth’s spin and the Coriolis Effect, winds of a low pressure system swirl counterclockwise north of the equator and clockwise south of the equator. This is called cyclonic flow. On weather maps, a low pressure system is labeled with red L.
A high pressure system has higher pressure at its center than the areas around it. Winds blow away from high pressure. Swirling in the opposite direction from a low pressure system, the winds of a high pressure system rotate clockwise north of the equator and counterclockwise south of the equator. This is called anticyclonic flow. Air from higher in the atmosphere sinks down to fill the space left as air is blown outward. On a weather map, you may notice a blue H, denoting the location of a high pressure system.
How do we know what the pressure is? How do we know how it changes over time? Today, electronic sensors in weather stations measure air pressure. These sensors are able to make continuous measurements of pressure over time. In the past, barometers were used and measured how much air pushed on a fluid, such as mercury. Historically, measurements of air pressure were described as “inches of mercury.” Today, meteorologists use millibars to describe air pressure.
Air pressure depends on temperature and density.
When you inflate a balloon, the air molecules inside the balloon get packed more closely together than air molecules outside the balloon. This means the density of air is high inside the balloon. When the density of air is high, the air pressure is high. The pressure of the air pushes on the balloon from the inside, causing it to inflate. If you heat the balloon, the air pressure gets even higher.
Answer:
not sure
gfghyn fesdf
Explanation:
Which of the following is a major challenge to volcano preparedness?
Answer:
The main parts of a volcano include the magma chamber, conduits, vents, craters and slopes.
Explanation:
6 ways volcanoes benefit Earth, our environment
Atmospheric cooling. ...
Land formation. ...
Water production. ...
Fertile land. ...
Geothermal energy. ...
Raw materials.
answer this question plsss
9. Why is the law of conservation of mass true?
a. All atoms at the start of a chemical reaction are present at the end of the reaction.
b. All the molecules in a substance remain intact during a chemical reaction.
c. The substances at the start of a chemical reaction gather more atoms to make up
for those lost in the reaction.
d. All molecules at the start of a chemical reaction are present at the end of the
reaction
Answer:
I think it's D but I'm not too sure. Let me know if it's correct !
What are the types of asexual reproduction? Describe each.
Indicate the relative ages of the fossilized organisms listed below by
placing them in a strata on the diagram of a cross section of sedimentary rock below
Answer:
a-youngest fossils
b-mammal fossils
c-first dinosaurs
d-first land plants
e-trilobites
f-oldest fossils
a-youngest fossils
b-mammal fossils
c-first dinosaurs
d-first land plants
e-trilobites
f-oldest fossils
What is fossils?Fossils generally helps in relative dating of rocks. The Trilobites are considered the oldest in this rock sequence when we apply the principle of superposition of strata. The principle states that "in an undeformed/undisturbed sequence of rock, the oldest is always at the bottom while the youngest is on top". This principle therefore explains why the Trilobites at the base are considered the oldest.
How is the layer of iridium used to tell the relative age of different rock strata and fossils" it can be said that rock strata and fossils can have there ages detected by following the layer of irudium over the newer ones recently dropped.
It is important to note that iridium is an element that has had its deep root on earth for the longest of times Because of this unending deposition of iridium all over the earth. There is a particle of iridium on most rock strata and fossils allover the earth. Now rock strata and fossils can have there ages detected by following the layer of irudium over the newer ones recently dropped.
Therefore, a-youngest fossils
b-mammal fossils
c-first dinosaurs
d-first land plants
e-trilobites
f-oldest fossils
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What process converts RNA to an Amino Acid?
Answer:
translation
Explanation:
Translation is the process that takes the information passed from DNA as messenger RNA and turns it into a series of amino acids bound together with peptide bond
When you move material across the cell membrane from an area of
high concentration to an area of low concentration.
1. Passive Transport
2. Active Transport
Answer: it’s a type of active transport.
Explanation:
Just took it on edge:)
Based on the information in the table, how should the researcher classify each fungus?
A.
Fungus X is a common mold, and fungus Y is a chytrid.
B.
Fungus X is a chytrid, and fungus Y is a sac fungus.
C.
Fungus X is a chytrid, and fungus Y is a common mold.
D.
Fungus X is a common mold, and fungus Y is a sac fungus.
Answer: C, Fungus X is a common mold and fungus Y is a Chytrid.
Explanation:
I just took the test
Answer:
A. Fungus X is a common mold, and fungus Y is a chytrid
100 POINTS
a gene has the following nucleotide sequence TTCAGAGGT What amino acid sequence will the resulting protein have?
Answer:
im not gay
Explanation:
what does it mean when they say that rock erodes?
a. it gits thicker and more compact
b. it pushes up through the ground
c. it breakes down and dissolves
d. it forms a new kind of rock
Answer: c) it breaks down and dissolves
Answer:
c
i don't know how to explain it but erode means to gradually wear away so that gives you the answer
When mRNA is made from DNA it is called
The then gets translated into a
protein with the help of a ribosome. In a Gene each base triplet or stands for either start,
stop, or These are what chain together to form
Answer:
When mRNA is made from DNA it is called transcription
Each base triplet or Codon
Start, Stop, or an Amino Acid
these are amino acids that chain together to form Proteins
Hopefully I got all the blanks. Maybe put underscores or something in next time. Very Confusing
All of the following are found in a DNA molecule except
Answer:
But in a molecule of DNA you can find four nitrogen-containing nucleobases: cytosine, guanine, adenine, and thymine. It also contains a sugar called deoxyribose and a phosphate group.
Explanation:
Trisodium phosphate The prefix Tri means what? *
Answer:
the prefix tri means three
Answer:
tri means "three"
Explanation:
common english vocabulary words that contain this prefix include trio and triangle.
Helppppp........!ASAP
Answer:
E. Confident
Explanation:
Holding eye contact, having firm movements and a strong voice are all clear indictators of a sense of self-confidence.
Answer:
I'm pretty sure it's e sry if I get it wrong
