An ectotherm vertebrate that usually lives in water when young by may live on land as an adult.

An organism that eats other animals.

A flexible supporting tissue that makes up part or all of some animals' skeletons.

Not able to maintain a constant body temperature by internal means; cold-blooded.

Able to maintain a constant body temperature by internal means; warm-blooded.

A period of slowed life processes that permits certain animals to survive hot, dry weather.

An organism that eats plants.

A period of slowed life processes that permits certain animals to survive for winter conditions.

A mammal whose young develop in a pouch.

To shed scales, feather, fur, or an exoskeleton.

A mammal that reproduces by laying eggs.

The structure that connects a developing embryo to the placenta and that has blood vessels for the exchange of food, wastes, oxygen, and carbon dioxide with the morther.

Food material stored in an egg to nourish the embryo.

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