Question

question 1 of 10
which organisms fix nitrogen into forms like ammonia?
a. bacteria
b. humans
c. plants
d. algae

Explanation:

Nitrogen - fixing bacteria convert atmospheric nitrogen (\(N_2\)) into ammonia (\(NH_3\)). This process is crucial for the nitrogen cycle. Humans, plants, and algae do not have the biological machinery to directly fix nitrogen into ammonia like bacteria do. Bacteria such as Rhizobium (which forms symbiotic relationships with legume plants) and Azotobacter (free - living soil bacteria) are well - known nitrogen - fixing bacteria.

Answer:

A. Bacteria