Question

Although 78% of earth's atmosphere is nitrogen, nitrogen is limited in most ecosystems because __________.

Answer 1

Because the natural conversion of atmospheric nitrogen occurs via only lightning and nitrogen-fixing bacteria.

Step-by-step explanation:

Nitrogen, which means “saltpeter former” or “what forms nitrates”. It is one of the most abundant elements in the universe. On Earth it is mostly gaseous, filling up to 78% of atmospheric air volume. However, despite its abundance, this element is limited to living things in most ecosystems. This is because most living things are unable to absorb nitrogen in its gaseous form and need a convention of atmospheric nitrogen in an assimilable form. The natural conversion of atmospheric nitrogen occurs only through nitrogen-fixing bacteria, these bacteria are called Rizobium.

Answer 2

Although 78% of earth's atmosphere is nitrogen, nitrogen is limited in most ecosystems because its particular form cannot be assimilated by organisms. Most organisms require nitrogen that are in its fixed form such as ammonia or ammonium. The readily available nitrogen undergoes fixation processes first through some microorganisms for it to be processed by these organisms.