| A | B |
|---|
| arachnids | arthropods with two body regions |
| Arthropoda | the largest phylum |
| water vascular system | a network of water-filled canals |
| exoskeleton | outer covering made of chitin |
| open circulatory system | bathes the internal organs in blood |
| tube feet | suction cups to help the animal move, feed, and get oxygen |
| pesticides | chemicals that kill undesirable plants and insects |
| echinoderms | spiny-skinned invertebrate |
| gizzard | structure in earthworms that grinds soil |
| appendages | arms, legs, and antennae |
| molting | shedding of the exoskeleton |
| cephalopods | means "head-footed" |
| bivalves | mollusks have a two part shell joined by a hinge |
| crustaceans | arthropods that have antennae and jaws used for crushing food |
| gills | breathing organs to get oxygen from the water |
| metamorphosis | series of changes from birth to adult |
| setae | bristles earthworms use to hold on to soil |
| spiracles | openings for air in some arthropods |
| closed circulatory system | food and oxygen is contained and transported in a series of vessels |
| mollusks | soft bodied animals with a hard shell |
| radula | tongue like organ in gastropods |
| mantle | structure that secretes the shell of mullusks |
| crop | temporary food storage site |
