| A | B |
|---|
| vertebrates | animals with a backbone |
| invertebrates | animals without a backbone |
| poriferan | pore - bearing |
| nematocysts | stinging cells of jellyfish |
| platyhelminthes | flatworms |
| nematodes | roundworms |
| annelids | segmented worms |
| regeneration | ability to regrow lost body parts |
| setae | bristles on the earthworm that help it move |
| crop | saclike organ that stores food in earthworms |
| gizzard | muscular organ that grinds food in earthworms |
| radula | tongue like structure used to scrape food into little pieces |
| echinoderms | spiny skin |
| arthropod | jointed legs |
| exoskeleton | outer covering made of chiton |
| gills | structures that allows the crustaceans to breathe |
| centipedes | carnivorous |
| millipedes | herbivorous |
| asteroidia | class containing starfish |
| metamorphosis | developmental process of insects |
