What is selective breeding, also called artificial selection? When humans allow all organisms to breed
randomly.

When humans select specific traits and only
breed those individuals.

When females select which male to
reproduce with

When males select which female to
reproduce with

Nitrogen fixation by azotobacter.

Explanation:

Nitrogen fixation explains the

role azotobacter plays in the conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, something special about this conversion is that these microorganisms are in the soil, and the forms they convert Nitrogen into, is a form that can be assimilated by plants.