Answer:
Mammals are most
adapted among the vertebrates and the following features explain the justify
this statement.
(i) They are found
in variety of habitats, i.e., polar ice caps, deserts , mountains, forests, grasslands
and dark caves.
(ii) They
have better developed brain. The brain bears large cerebellum and cerebrum.
(iii) The
most unique mammalian characteristic is the presence of milk producing
glands(mammary glands) by which mammals nourish their young ones.
(iv) Mammals
are homeotherms (warm blooded), i.e., they are capable of maintaining their body
temperature regardless of to the surrounding environment.
(v) They
possess oil secreting glands (sebaceous glands) and sweat glands (soporiferous
glands) in the skin.
(vi) They
possess,; two pair of limbs, that are well adapted for walking, running,
climbing ,burrowing , swimming and flying.
(vii) fertilization
is internal. They show viviparity with few exceptions e.g., oviparous -
Ornithorhynchus (platypus) and the development is direct, e.g., viviparous ?Macropus(kangaroo),
Rattus (rat), Canis (dog), Delphinus (common dolphin), Panthera Tigris(tiger),
etc.
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