Evolution of animals:

1) Sea weeds and few plants existed probably around 320 mya. Jawless fish probably evolved around 350 mya.500 mya, invertebrates were formed and active.

2) 350 mya in 1938, a fish caught in South Africa namely, Coelacanth which was thought to be extinct. These animals called lobefins evolved into the first amphibians that lived on both land and water. However, these were ancestors of modern day frogs and salamanders.

3) The amphibians evolved into reptiles. They lay thick shelled eggs which do not dry up in sun unlike those of amphibians.
4) In the next 200 millions years or so, reptiles of different shapes and sizes dominated on earth. Some of these land reptiles went back into water to evolve into fish like reptiles e.g. Ichthyosaurs. The land reptiles were so called dinosaurs. The biggest of them, i.e., Tyrannosaurus rex was about 20 feet in height and had huge fearsome dagger like teeth. About 65 mya, the dinosaurs suddenly disappeared from the earth.

5) The first mammals were like shrews. Their fossils are small sized. Mammals were viviparous and protected their unborn young inside the mother’s body.

Evolution of vertebrates:

	Turtles, lizards, snakes, birds, crocodiles & mammals
Quaternary
Tertiary	Dihosaurs (Extinct)
Cretaceous
jurassic	Therapsids (Extinct)
Triassic	Thecodonts (Extinct)
Permian	Pelycosaurs (Extinct)
Carboniferous	Sauropsids & synapsids (Extinct)
Devonion	Early Reptiles (Extinct)