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What do echinoderms and chordates have in common?

The characteristic that enables efficient gas exchange in capillaries is:

Which of the following organs of cephalopods resemble those of the vertebrates?

A marine biologist visits your biology class and begins his talk entitled, “Life as a Trochophore.” A friend seated next to you asks, “What is a trochophore?” You explain that a trochophore is

When referring to an animal’s body, the dorsal surface is the __________________.

Animals can be divided into two main groups, the deuterostomes and the protostomes. Describe 3 key differences that distinguish protostomes from deuterostomes.

A true coelom (body cavity) is completely lined with:

Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have

The germ layer that gives rise to the outer covering of the animal body and the nervous system is the:

Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called