Answer is: <span>Mutations sometimes improve the chances of survival for a plant. </span>Mutations are very important because they change <span>variability in populations and in that way enable evolutionary change. </span>There are three types of mutations: 1) good or advantageous mutations - <span> improve the chances of survival for a plant. 2) </span>bad or deleterious - decrease the chances of survival for a plant. 3) neutral - not affect he chances of survival for a plant.
Nitrogen fixation is a chemical process by which molecular nitrogen in the air is converted into ammonia or related nitrogenous compounds in soil or aquatic systems. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms.
