All life would come to an end if there are no green plants.
Explain

So if there were no green plants, no food will be available for the other living organisms. ... During respiration, organisms use this oxygen for releasing energy. Without these 2 important aspects of food and oxygen, it would be difficult for life to survive on earth.

Explanation:

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.