| A | B |
|---|
| invertebrates | an animal that has no backbone |
| pore | a small opening or hole in a sponge |
| stinging cells | a cell that contains a poisonous thread |
| tentacle | an armlike part around the mouth of a stinging cell |
| parasites | a living thing that lives on or in another living and harms the living things in which it lives |
| flatworm | a worm with a flattened body and only one body opening |
| roundworm | a worm that has a round body and two body openings |
| segmented worm | a worm that has a body divided into sections |
| mollosk | an invertebrate that has a soft body |
| mantle | a fleshy covering that protects the mollosk |
| echinoderm | a spiny-skinned invertebrate that lives in the ocean |
| tube foot | a hollow structure with a sucker at the end |
| arthropod | an animal with jointed legs, a segmented body, and a hard outer covering |
| exoskeloton | the hard outer covering of an anthropod |
| molt | to shed the outer body covering |
| thorax | middle part of an insects body |
| abdomen | the rear part of an insects body |
