| A | B |
|---|
| bristles | Earthworms use this to cling to the walls of tunnels. |
| exoskeleton | Part of an arthropod that protects its body. |
| planarian | A flatworm that can rgenerate lost body parts. |
| tube foot | A hollow structure with a sucker at the end. |
| mollusk | An invertebrate with a soft body and one, two, or no shells. |
| arthropod | An invertebrate that has a segmented body, jointed legs, and a hard outer covering. |
| millipedes | Looks like a worm with many legs. |
| centipedes | Looks like a worm with fewer legs than a millipede. |
| shrimp, lobster, and crayfish | crustaceans |
| spiders, ticks, and mites | These animals have four pairs of legs, they also have two main body parts. |
| insects | The largest group of arthropod. They have three pairs of legs and a body that is divided into three main parts. |
| insect pest | An insect that causes damage to property or causes harm to people. |
| parasites | Round worms and tapeworms |
| hydra, jellyfish, and sea anemone | Use tentacles and stinging cells to capture food. |
| clams and snails | Have a muscular foot. |
| vertebrates | Animals with backbones. |
| Invertebrates | Animals without backbones. |
| starfish, sea cucumbers, and sand dollars | Have hard bodies covered with spines and use a tube foot to move. |
| sponge | An invertebrate with a simple body full of pores. |
| canals | Connects the pores of the sponge. |
| buds | Objects grown on the sides of sponges for reproduction. |
| flatworms, roundworms, and segmented worms | Three classifications of worms. |
| starfish, sea cucumber, sand dollar | Animals that have hard bodies covered with spines and move with tube foot. |
| hydra, jellyfish, and sea anemone | Animals with stinging cells. |
| roundworm, tapeworm, earthworm | Planarian belong in this group. |
| dog, zebras, monkey, cat, horse | Animals that are vertebrates. |
| clam, octopus, snail | Move by muscle foot. |
| hydra, jellyfish, sea anemone | Have tentacles for capturing food. |
| roundworm, tapeworm, earthworm | Parasites belong in this group. |
