<span>Calcium is used as a second messenger of amino acids,
IP3 and DAG activate protein kinases and increase the cytoplasmic concentration of Ca2+ which also acts a second messenger to modify the activity of cellular proteins.</span>
A) T<span>he evolution of multicellular life</span>
Answer: after organelles it cells,tissues,organs,organ system then it give you the last one which is organism.
Explanation:
The answer is going to be C