Mammals are the most adapted among the vertebrates because –

a) They are found in a variety of habitats like deserts, plains, mountains, polar ice caps, forests, etc.

b) Different types of teeth in the jaw.

c) Sexes are separate and fertilization is internal.

d) Have 2 pairs of limbs which are used for walking, burrowing, climbing, running, flying.

e) Mammals have mammary glands to produce milk to nourish their young ones.

f) Mammals are warm-blooded which helps them maintain their body temperature in different weather conditions.

g) The skin of mammals has hair which acts as insulation against cold.

h) They have sweat and oil glands which also help in temperature control.

i) A 4-chambered heart is present in mammals.

j) The brains are more developed.

k) Examples of Mammals : Humans, Whales, Dogs, Camels, etc