Answer:
Aa would be ur answer:)))
Answer:
Explanation:
The nitrogen cycle is an important cycle to the atmosphere. Nitrogen is an essential part of biological molecules such as proteins and nucleic acid, which makes nitrogen essential for all living organisms. Nitrogen makes up 78 percent of the atmosphere.
Answer:
D) meiosis
Explanation:
Basically, meiosis is required for sexual reproduction.
It is most affected in the surface zone.