In natural systems, nitrogen is lost by denitrification. predict which of the following processes will be most responsible for replacing lost nitrogen in an ecosystem.

The correct answer is:

fixation

Explanation:

Nitrogen fixation is a method by which nitrogen in the Earth's atmosphere is converted into ammonia or other molecules prepared to living organisms. Nitrogen fixation is carried by a diversity of bacteria, both as free-living organisms and in symbiotic association with plants. Because it is the primary source of the nitrogen in the soil, nitrogen that plants need to grow, nitrogen fixation is one of the most critical biochemical processes on Earth

a, i am pretty sure.