| A | B |
|---|
| To move, roundworms use their | hydrostatic skeleton |
| The nervous system of a roundworm includes | several ganglia |
| People can be infected with roundworms by | drinking contaminated water, eating contaminated food, biting insects |
| In earthworms, food is ground into small pieces in the | gizzard |
| The body of an annelid has | segments |
| In annelids, nitrogen-containing wastes are eliminated by | nephridia |
| Mollusks have | a true coelom |
| The thin layer of tissue that covers a mollusk's body is called the | mantle |
| In the open circulatory system of some mollusks, blood is found | in blood vessels and sinuses |
| A pond snail is an example of a (an) | gastropod |
| The most active mollusks are the | cephalopods |
| The feeding types that occur within the phylum Mollusca include | herbivores, carnivores, and detritivores |
