Where does most of the nitrogen in earths atmosphere come from?
a: fires
b: erosion
c: bacteria
d: the breakdown of carbon dioxide

Explanation:

This is the only answer that make sense, because nitrogen fixation is carried out by bacterias, algae and human activity. When organisms use it and release it, nitrogen is suffer a breakdown process, traveling as a gas to the atmosphere.

d. in sexual reproduction, offspring have more chromosomes than

either parent.

asexual reproduction results in offspring which are genetically the same as the parent organism (not counting a rare mutation). sexual reproduction produces a random mixture of the genetics derived from both parents

explanation: