Answer:
atoms
Explanation:
everything is made from atoms
Answer:
cells
Explanation:
cells are the smallest unit that can carry life
Answer:
I am leaning towards D because everything changes during Cell differentiation the functions changes and goes through many different cycles.
Explanation:
<span>Norepinephrine uses the Second
Messenger System, which means, cells signal to each other what molecules have
been released that will trigger a physiological reaction. </span>
<span>
This phenomenon is activated after the ligand (ion or molecule) is bonded to its receptor
(protein molecule), creating a variation that causes a chain-reaction, that will
finally activate the Second Messenger. The latter will activate intercellular
molecules that will be able to control the cell’s activity. </span>
