The answer is C. Photosynthesis.
I hope this helps.
Have a nice day. :)
Explanation:
Applying the neutral theory of molecular evolution, it is believed that molecular evolutionary clock that is universally acceptable and exact would exists, the rate of mutation for neutral alleles for a given molecule per year were exactly equal with all organisms always.
<span>Vertebrates and invertebrates</span>
This atom placed in 14th group of the periodic table has a relatively small mass and can form four different bonds according to it's valence. That's what allows it to form a large variety of compounds.