Question

which organisms transform nitrogen to a form that is useful to plants?bacteriaanimalsfungi humans

Explanation:

Nitrogen - fixing bacteria play a crucial role in the nitrogen cycle. They convert atmospheric nitrogen (\(N_2\)) into ammonia (\(NH_3\)) through nitrogen - fixation. This ammonia can then be further converted into nitrates (\(NO_3^-\)) by nitrifying bacteria. Plants can absorb nitrates and use them for growth. Animals, fungi, and humans do not have the ability to directly transform atmospheric nitrogen into a form that plants can use.

Answer:

A. bacteria