Fishes

Fishes are cold blooded animals which breathe through gills and have the simplest skeleton among vertebrates.

Reptiles

Most of reptiles are carnivorous; they are oviparous though some reptiles like the snake are ovoviviparous.

Birds have their body covered with feathers and wings as anterior extremities, they breathe through lungs.

Most of mammals have four legs as extremities which allow them to move from one place to another.

Herbivore

Carnivore

Balanced food