Answer:
The
important features of class Mammalia are:
(i)They are warm-blooded animals.
(ii) Their heart is four-chambered.
(iii) They have mammary glands which produce milk with
which they nourish their young ones.
(iv) They give birth to young ones, with the exception of
platypus and echidna.
Kangaroos give birth to very poorly developed young ones.
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