A mollusk with two shells that are held together by powerful muscles.
Bivalve
True or False: Most sponges live in freshwater.
False. Most live in saltwater.
The type of cnidarian that forms reefs.
Coral
A worm that has ring-like segments on the outside of its body.
Segmented Worm
Bulblike suction structures lining the arms of an echinoderm.
Tube Feet
An ocean mollusk with a head, tentacles, and beaklike jaws.
Cephalopod
The parts of a sponge include the flagella, the collar cells, the osculum, and the ___________________.
Spicules
The only freshwater cnidarian
Hydra
A worm with an unsegmented body that moves by flipping or bending.
Round Worm
Symmetry of adult echinoderms.
Five-part radial symmetry
A mollusk with a single shell or no shell, and a foot for movement.
Gastropod
These line the inner chamber of a sponge.
Collar cells
A cnidarian with a bowl-shaped body
Medusa
A worm with a soft, ribbon-shaped body, a mouth, and a gut.
Flatworm
How does a sea cucumber defend itself?
Spews out its intestines.
A mollusk's hard, strong band scrapes food or bores into objects.
Radula
Undigested food and carbon dioxide exit the sponge through one or more larger openings called ________________.
Oscula
A polyp cnidarian that looks like a flower.
Sea Anemone
The 3 groups of worms that are studied the most.
Flatworms, roundworms, and segmented worms.
This echinoderm can easily snap off one of its arms to escape predators.
Brittle Star
This cephalopod injects saliva into its prey to paralyze it.
Cuttlefish
Name the two ancient civilizations that padded their helmets and armor with sponges.
Ancient Greeks and Romans
A special stinging cell on a cnidarian's tentacles
Nematocyst
Why must earthworms remain moist?
Because oxygen and carbon dioxide pass directly through their skin, but only if it is moist.
What do the Scarecrow from the Wizard of Oz and an echinoderm have in common?
They both lack a brain