Question

which organisms change nitrogen from an atmospheric gas into a useful form?
○ fungi
○ bacteria
○ plants
○ animals

Explanation:

Nitrogen fixation is the process of converting atmospheric nitrogen (\(N_2\)) into a usable form (like ammonia). This process is mainly carried out by certain bacteria (e.g., rhizobia in root nodules of legumes, or free - living nitrogen - fixing bacteria). Fungi are not involved in nitrogen fixation. Plants can take up fixed nitrogen but can't fix atmospheric nitrogen themselves. Animals obtain nitrogen by consuming other organisms and don't fix atmospheric nitrogen.

Answer:

bacteria