after we breath in oxygen it is transferred to red blood cells. So it is important for cellular respiration.
All of these are, so the best choice would be "none of the above", unless you have another choice.
That one is a struggle but if i had to pick one i think i would do calf 4.
Answer:
Messenger RNA (mRNA) carries the instructions for making proteins. Like DNA, proteins are polymers: long chains assembled from prefab molecular units, which, in the case of proteins, are amino acids. A large molecular machine* called the ribosome translates the mRNA code and assembles the proteins.
