Which of the following class is being described by the given statements (i - iv)? (i) They are f...

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Which of the following class is being described by the given statements (i - iv)?
(i) They are found in a variety of habitats- polar icecaps, deserts, mountains, forests, grasslands and dark caves.
(ii) M ost unique mammalian characteristic is the presence of mammary glands by which the young ones are nourished.
(iii) Heart is four-chambered.
(iv) Sexes are separate and fertilization is internal.
(A) Reptilia
(B) Aves
(C) M ammalia
(D) A mphibia
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