Cnidarians have a radially symmetrical cup or bag-like body made up of two layers of cells.

Like jellyfish, box jellyfish can swim and feed on plankton, but are weak swimmers.

During torsion, gastropod bodies twist into a permanent line that separates the organs.

Squid differ from cuttlefish in that they're streamined for open water living and have two tentacles that are longer than others for seizing prey.

The crustaceans in order Decapoda are important to the fishing industry because they may replace shrimp, lobsters and crabs as a food source.

The two major cell types in a sponge's tissues are

Sponge larvae are more animal-like than adult sponges because

The largest class in phylum cnidaria is class ______, which includes _______.

Fire corals and siphonophores are in class

Ctenophores differ from jellyfish by

Ctenophores eat

_____________ may possibly be the longest animal in the world.

Organisms in phylum Mollusca include

Members of phylum Mollusca generally share _______, _______ and _______.

The mollusks in class Gastropoda are

Mollusks in class Bivaliva

Mollusks in class Cephalopoda include

The _____________ is thought to be the most intelligent vertebrate

Members of phylum Echinodermata are similar to chordates because