Mammals are most adapted among the verte | Class 11 Biology Chapter Animal Kingdom, Animal Kingdom NCERT Solutions

Mammals are most adapted among the vertebrates. Some of the reasons are as follows:

1. Mammals are found in the variety of habitats like polar ice caps, deserts, mountains, forests, grasslands and dark caves. Some of them are adapted to fly and swim.
2. They have mammary glands that produce milk to nourish their young ones.
3. They are warm- blooded means they are capable to maintain their body temperature in different conditions.
4. They differ in the type of jaws and sexes are separate and fertilization is internal.
5.  They use their pair of limbs for walking, burrowing, climbing etc. they are viviparous with few exceptions and development is direct.
6. They have four- chambered heart.
7. The skin of mammals is unique in possessing hair. Their external ear are present.
8. Respiratory organ is lung and excretory organ is kidney. They reproduces sexually. They breathe oxygen and release carbon dioxide.
9.  Their brains are more developed. Example: Humans, Whales, Dogs etc.