| A | B |
|---|
| vertebrate | has a backbone |
| invertebrate | does not have a backbone |
| endoskeleton | system of connecting bones inside the body |
| exoskeleton | skeleton outside the body |
| sponge | animal that filters the water to get food |
| cnidarians | animals with ability to sting |
| tissues | groups of cells that work together |
| flatworm | has flattened body |
| roundworms | round, tubelike body |
| parasite | survives by living on or in another animal and feeding on it |
| segmented worms | bodies made up of connected sections |
| mollusk | animal with soft body no bones |
| arthropod | animal with jointed exoskeleton |
| arachnids | have 8 legs and no antennae |
| insects | have 6 jointed legs |
| echinoderms | invertebrates with internal skeletons and spines |
