What great discoveries of science have allowed scientists to draw a conclusion about the biological nature of man

What great discoveries of science have allowed scientists to draw a conclusion about the biological nature of man – about his unity with other living organisms living on Earth?

Firstly, this is the theory of evolution, created by Charles Darwin at the end of the 19th century, which explained how, thanks to gradual natural selection and variability, some types of organisms can turn out to be different. Secondly, the discovery in 1953 of the structure of DNA, then scientists learned to “read” this genetic code and it turned out that the DNA of all living organisms from bacteria to humans is built in a similar way.