Class Mammalia –

– Aquatic, terrestrial and aerial.

– Mammary glands present for milk production.

– Two pairs of limbs.

– Skin with hair.

– Ear with pinna.

– Homoiothermic.

– Heart four chambered.

– Excretion by kidneys.

– Respiration by lungs.

– Sexes separate.

– Internal fertilisation, vivipary (exception Platypus).

– eg. Whale, Rat , Man, Tiger etc.

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