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romanna [79]
3 years ago
8

What do your veins do to keep your blood flowing in one direction?

Biology
1 answer:
yanalaym [24]3 years ago
6 0
What Re your answer choicemsns
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hey could someone help me with this immediately!! i’ll mark brainiest if u don’t guess or leave a link!
Ivan

Answer:

by letting the oil float to the top and skimming it off

Explanation:

4 0
2 years ago
Read 2 more answers
Why did Charles Darwin predict that tetrapods evolved from fish?
qwelly [4]

Answer:

fish and tetrapods are both vertebrates that have a backbone with a spinal cord. fish lived before tetrapods because their fossils are in rocks over 500 million years old.

Explanation:

fish and tetrapods are both vertebrates that have a backbone with a spinal cord

8 0
2 years ago
What means RNA and it shape in the biology
MaRussiya [10]

The Answer is ribonucleic acid, a nucleic acid present in all living cells. Its principal role is to act as a messenger carrying instructions from DNA for controlling the synthesis of proteins, although in some viruses RNA rather than DNA carries the genetic information.

RNA is typically single stranded and is made of ribonucleotides that are linked by phosphodiester bonds.

I hope this helps you:)

5 0
3 years ago
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1) The molecule that serves as the major source of readily available fuel for neurons and blood cells is ________.
Talja [164]
Glucose, your answer would be B.
7 0
3 years ago
Describe some of the modifications that polypeptide chains undergo before becoming functional proteins
umka2103 [35]
Polypeptide chains undergo some modifications before they become fully functional. Some of these modifications include: proteolytic cleavage, lipidation and glycosylation. Proteolytic cleavage refers to the removal of some amino acids from a polypeptide chain by proteases in order for the protein to become active. An example of a substance that is modified through this process is insulin.
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