Question

which of the following can convert nitrogen in the air into a form plants can use?
a. bacteria
b. fungi
c. protists
d. animals

Explanation:

Certain bacteria, like rhizobium, can perform nitrogen - fixation, converting atmospheric nitrogen into ammonia or other nitrogen - containing compounds that plants can use. Fungi, protists, and animals do not have this ability to directly convert atmospheric nitrogen into a plant - usable form.

Answer:

A. bacteria