Write two characteristics each of

a. birds.
b. amphibians.
c. reptiles.

a. Two characteristics of bird are:

1. Their skeleton is very light because their bones have large air cavities. They have horny beaks and no teeth.
2. They are the only animals whose body is covered with feathers.

b. Two characteristics of amphibians are:

1. They breathe with lungs on land, and through their moist skin in water.
2. They are cold-blooded animals.

c. Two characteristics of reptiles are:

1. Their skin is covered with horny epidermal scales.
2. They breathe through lungs.