First slide

Classification of Animals

Question

Which of the following correctly describes an animal group without a single exception?

Easy

A

All reptiles possess scales have three-chambered heart and are cold blooded.
B

All birds are oviparous.
C

All sponges are marine and are viviparous.
D

All mammals are viviparous and possess a diaphragm for breathing.

Solution

All birds are oviparous, without a single exception.
Among reptiles, crocodilians have a four-chambered heart.
Most sponges are marine. Some (e.g., Spongilla) live in freshwater.
Prototherian mammals (e.g., platypus) are oviparous.

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