<span>I believe the answer is: D. proteins
The main functions of these proteins is to allow specific substance to pass through the membrane of the cells which needed for the energy formation for cells'functions.It created through the combination of more than 20 amino acids with different functions.</span><span />
Protein expression refers to the way in which proteins are synthesized, modified and regulated in living organisms.
Hope this helps :D
Answer:
I know that its true that fish have 4 limbs and its also true that sharks have bony skeletons
Explanation:
No the myelin covers bits of the cell
