Question

What do fossils tell us about the process of evolution?
Why did Mendel choose garden pea for his experiments
Why do human beings who look so different from each other in terms of size, color, and looks are said to belong to the same species?

Answer 1

Fossils show ages of existence fossilized organisms and help us to study evolutionary relationship.
Mendel choosed garden pea because it exhibited traits which was easily observable and grew quite quick.
Humans belong to same species and they are of same species as the size, colour and looks are due to adaptation of ancient humans who travelled from Africa