Which animals are ectotherms with thick, dry, waterproof skin?

Why might a farmer like to see snakes in a barn where grain is stored?

Snakes can swallow their prey whole because they have ___.

Which of the following organisms is an amphibian?

Water taken in through the mouth of a fish passes over the ___, where oxygen and carbon dioxide are exchanged.

Most reptiles have a ___ heart.

The word ___ comes from the Greek word that means 'double-life'

Most fish ___ are made of bone and can be tooth shaped, diamond shaped, cone shaped, or round.

What structures are found in the chest cavity of amphibians and used for exchange of oxygen and carbon dioxide?

Metamorphosis is a part of what process in amphibians?

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