Embryology

Archaeopteryx

Use and disuse theory

Who is the great naturalist and philosopher of 18th century?

Discontinuous variation

The study of comparative embryology of different animals, supports the concept of evolution

Archaeopteryx is the oldest known fossil bird

Lamarck’s use and disuse theory states that if an organ is used constantly, the organ develops well and gets strengthened

Charles Darwin

These are sudden changes which occur in an organism due to mutations.