First slide

Classification of Animals

Question

The crow differs from the crocodile in having

Easy

A

Dry and cornified skin
B

Pneumatic bones
C

Four-chambered heart
D

Direct development

Solution

The long bones of birds are pneumatic (hollow with air cavities).
Four-chambered heart and direct development are common to the crow and the crocodile.
Dry cornified skin is present in reptiles. Birds have dry skin with an oil gland at the base of the tail.

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