First slide

Classification of Animals

Question

In which one of the following options, a category of animals is correctly described with no single exception in it?

Moderate

A

All vertebrates possess jaws.
B

All amphibians have two pairs of limbs.
C

All reptiles are possess three-chambered heart.
D

All protochordates are marine.

Solution

All protochordates (urochordates and cephalochordates) are marine.
Among vertebrates, jaws are absent in Agnatha (Cyclostomata).
Some amphibians (e.g., Ichthyophis) are limbless.
Among reptiles, crocodiles have four-chambered heart.

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