Question

in which type of plant are nitrogen - fixing bacteria commonly found in the roots?
trees such as oaks
legumes such as beans
aquatic plants like kelp
green algae on rocks

Explanation:

Nitrogen-fixing bacteria form a symbiotic relationship with the root nodules of leguminous plants, converting atmospheric nitrogen into a form usable by the plant. The other plant types listed do not typically host these bacteria in their roots.

Answer:

legumes such as beans