| A | B |
|---|
| Phylum Nematoda | Phylum of roundworms. (Ex: Ascaris, hookworm, and Trichinella) |
| Ascaris | Intestinal roundworm that infects children who eat unwashed food. |
| Trichinella | Roundworm parasite found in undercooked pork. |
| Hookworms | Roundworm parasite common in tropical regions when people walk barefoot. |
| setae | Bristles found along the sides of segmented worms. |
| gizzard | Muscular food grinding sac in earthworms. |
| nephridia | Excretory (waste filtering) structures found in each segment of an earthworm. |
| crop | Small sac that holds soil temporarily before it passes into gizzard of an earthworm. |
| parapodia | "Sort-of feet" found in segmented worms like bristleworms and Nereis. |
| Phylum Annelida | Phylum of segmented worms that includes earthworms and leeches. |
| Phylum Arthropoda | Phylum of "jointed-leg" animals that includes insects and crustaceans. |
| molting | Shedding of the exoskeleton as an arthropod grows. |
| cephalothorax | Fused head and thorax sections in arthropods such as shrimp and lobsters. |
| tracheal tube | Branching tubes through which land-based arthropods bring air into their body. |
| spiracle | Opening in thorax and abdomen through which air enters and leaves tracheal tubes. |
| book lung | Air-filled chamber of leaf-like plates that spiders use to breathe. |
| mandible | Jaw parts on most arthropods. |
