Question

which of the following does not conduct nitrogen fixation? nitrogen-fixing bacteria humans peanuts algae

Explanation:

Nitrogen fixation is the process of converting atmospheric nitrogen ($N_2$) into ammonia or related compounds. Nitrogen - fixing bacteria can fix nitrogen. Some plants like peanuts (legumes) have symbiotic relationships with nitrogen - fixing bacteria and can be involved in nitrogen fixation. Algae (certain cyanobacteria - type algae) can also fix nitrogen. Humans do not have the biochemical mechanisms to convert atmospheric nitrogen into a usable form (like ammonia) through nitrogen fixation.

Answer:

Humans