Nitrogen is required for protein formation. What is responsible for the bulk of nitrogen fixation? A.
air

B.
animals

C.
bacteria

D.
lightning

The factor with the responsibility for nitrogen fixation is bacteria (option C).

Explanation:

The nitrogen that contributes to the formation of proteins comes from plants. Due to the inorganic nature of nitrogen, plants require bacteria to contribute to the assimilation of this element, a process called biological nitrogen fixation.

Nitrogen fixing bacteria in plants are called diazotroph and, in some cases, establish a symbiosis with the plant's roots, the rhizobia.

blue

light-years

magnitude

i believe the answer would be b. hope it : )