| (i) They are found in a variety of habitats- polar ice-caps, deserts, mountains, forests, grasslands and dark caves. |
| (ii) Most unique characteristic is the presence of mammary glands by which the young ones are nourished. |
| (iii) Heart is four-chambered. |
| (iv) Sexes are separate and fertilisation is internal. |
A) Reptilia
B) Aves
C) Mammalia
D) Amphibia
Correct Answer: C
Solution :
[c] Mammals are tetrapod that have hair, a four-chambered heart, a diaphragm, and mammary glands.
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