Echinoderms live ___.

Echinoderm means ___.

Echoinderm larvae have ___.

Echinoderms contain a (n) ___ similar to the kind that vertebrates have.

An ampulla regulates ___.

The plate on the top of a sea star through which water enters the vascular system is called the ___.

The tiny suckers on a sea star's arms that help it to move and capture food are called ___.

Around the mouth of a sea star is a circle of nerve fibers called a ___.

In sea stars, a ___ runs form the nerve ring to the tip of each arm.

Name the four major groups of echinoderms.

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