What evidence did Darwin used to support his theory of evolution check all that apply no cap I will give as many points as you wish (jk lol)

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

How does the study of genetic disorders such as pku biologists understand normal alleles?

In which ways are mercury and venus similar?