Fishes, Amphibians and Reptiles

Animals with a backbone are called

vertebrates.

Animals that maintain a constant body temperature are called

endotherms.

Animals whose body temperature fluctuates with the temperature of their environment are called _____.

ecotherms

____ are fanlike structures that help fish move, steer, stop, and balance.

Fins

Many fishes have bodies covered by ____, which protect the body and

reduce friction as they swim through the water.

scales

A row of tiny sense organs along each side of a fish’s body is called the

lateral line system.

Most fish breathe by using their

gills.

____ are organs that remove oxygen from the water.

Gills

The ____ is a balloonlike organ that is filled with oxygen and other gases

from the bloodstream.

swim bladder

Amphibian means

“double life.”

Tadpoles change into frogs by the process of

metamorphosis.

_____ have special jaws with five joints that allow them to open their mouths

wide and swallow very large prey.

Snakes