First slide

Classification of Animals

Question

Which of the following characters is present in all mammals, without even a single exception?

Easy

A

Mammary glands
B

Ear pinna
C

Diphyodont dentition
D

Circular and biconcave RBC

Solution

Mammary glands are found in all the mammals without exception.
Ear pinna are absent in mammals like platypus, whales, etc.
Dentition is polyphyodont in some mammals like manatees, elephants and kangaroos.
Camels and llamas have oval RBCs.

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