| A | B |
|---|
| abdomen | the end part of an insect's body |
| appendages | arms, legs, wings, claws, and feelers |
| arachnids | arthropods with four pairs of legs, spiders |
| arthropods | animals with exoskeletons, segmented bodies, and jointed appendages such as insects and arachnids |
| crustaceans | a group of arthropods, such as crabs and lobsters, that generally live in water |
| exoskeleton | a tough stiff covering or shell around the body of an organism |
| host | an animal on or in which parasites live |
| invertebrates | animals without backbones |
| mollusks | animals with soft bodies that are not divided into segments such as snails, oysters, and clams |
| parasites | organisms that live on or inside other organisms |
| testes | the male organs the produce sperm cells |
| thorax | the middle part of an insect's body |
| vertebrates | animals with backbones |
| sponges | animals that live in the ocean, spend most of thier lives on a rock, many pores and openings |
| tentacles | fleshy-like arms, on a jelly-fish |
| parasites | an animal that lives on or in another animal |
| host | parasites feed of the flesh and blood of the host |
| planarian | a flatworm that is not a parasite, lives in streams and ponds |
| roundworms | more complex than flatworms, have a simple digestive system |
| segmented worm | common earthworm, used for fishing |
