The branch of biology that explains both the diversity and the unity of life is . microbiology taxonomy evolution genetics

Evolution

Explanation:

Evolution is the change in habits, hereditary and physical characteristics of a species over various generations in response to environmental conditions. Evolution lead to adaptation, the nature selection of the fittest and elimination of remaining.

Evolution may produce variety and diversity in response to mutation, genetic drift and other genetic variation. These changes may pass to offspring and may express them more in one group of population.

Evolution also explain the unity among organisms by explaining their shared characteristics. This refers to their common ancestors.

its 42

i say its d?

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.