Answer:
Evolution study, cell study, homeaostatsis and genetics
Step-by-step explanation:
Biology deals with unification in biological diversity among species. There are four ways of unifying biology a) evolution, b) Cell study, c) homoeostasis and d) genetics
As per the theory of Charles Darwin, it is believed that all species have evolved from single common ancestors who later got diversified through the processes of natural and artificial selection. Theory of evolution determines how cellular divisions during sexual and asexual reproduction carry forward genetic material to offspring. Sexual reproduction causes variation in offspring in order to make them adaptable to the existing environment