These plants have nitrogen fixing bacteria living on their roots to help convert unusable nitrogen into usable nitrogen:
a. mosses
b. fungi
c. algae
d. legumes

legumes

Explanation:

legumes have nitrogen fixing bacteria in their roots

it's c. (to reduce the greenhouse effect/carbon gasses)

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: