How has charles darwin contributed to the study of evolution?
a)he proposed the theory of natural selection.
b)he excavated and studied fossils.
c)he was the first one to use a 3-d printer.
d)he proposed the genetic relationship between species.

A)He proposed the theory of natural selection.

Explanation:

The naturalist Charles Darwin stated that through natural selection the species of living beings have evolved from a common ancestor.

Darwin conceived natural selection as the differential survival of organisms. Darwin postulated that the gradual accumulation of variations will bring changes in organisms that result in the appearance of new species.

im not intirely sure but i think the anwser is d relative humidity

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.