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 is the correct answer.

Explanation:

Charles Darwin gave the modern evolutionary thought along with Alfred Russel Wallace. According to his theory natural selection is the main force in evolution. He is considered to be the greatest thinker of Biology. His concepts helped to understand the diversity of the natural world. He developed his ideas into the principle of natural selection. It combines differential reproduction, heritable variation, and struggle

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