Charles Darwin wrote origin of species he was actually _____?

Charles Darwin wrote origin of species he was actually _____?

چارلس ڈارون نے انواع کی اصلیت لکھی وہ دراصل _____ تھا؟
Explanation

Charles Darwin was an English naturalist and biologist.

He is best known for his theory of evolution through natural selection.

It he detailed in his book "On the Origin of Species."