The circulatory system of mammals has a ___________________ chambered heart.

Compared to amphibians and reptiles, mammals are

Mammals are characterized by

Unlike reptiles young mammals depend on their parents for

Mammals that give birth to fully developed live young are termed

If an animal has long canine teeth and sharp molars it is probably a

Mammals are adapted to live in the following environments:

In mammals the powerful muscle that aids in breathing is the

How are living mammals classified into groups?

Which structure in female mammals produces milk to nourish young?

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