Vestigial organs

Homologous organs

Atavism

Define Evolution .

Intraspecific struggle

The degenerated and non-functional organs of animals are called vestigial organs.

The homologous organs are those which have inherited from common ancestors with similar developmental pattern in embryos.

The reappearance of ancestral characters in some individuals is called atavism.

Evolution is the gradual change occurring in living organisms over a period of time.

Competition among the individuals of same species