All vertebrates share what trait?

Fish are divided into how many groups?

Fish, amphibians, and reptiles all

What is the term used to describe cold blooded animals?

The name amphibian means:

Mammals do not lay eggs:

The group of mammals that give birth to tiny under-developed young are the:

Birds' feathers are used to:

Birds and mammals are more alike than other vertebrates because they:

There are how many kinds of reptiles?

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