Respuesta :

A. bacteria

This answer is correct on Plato. It should be correct for any other website as well.

Answer:

Nitrogen fixing bacteria

Explanation:

Nitrogen fixing bacteria have ability to processes nitrogen in the atmosphere and makes it available to other living forms in a usable form. Rhizobium is one of the example of nitrogen fixing bacteria that is found in root nodules of legumes. This bacteria can convert the nitrogen into biologically useful form ammonium which is used by plants.