What are fossils? What do they tell us about the process of evolution?

Explanation

Fossils are the remains of organisms that once existed on earth.
a. They tell us about-the development of the structures from simple structured to complex structured organisms.
b. They tell us about the phases of evolutions through which they must have undergone in order to sustain themselves in the competitive environment
c. These fossils tell us about many extinct animals and also give insight into how the evolution could have taken place.