| A | B |
|---|
| abdomen | The end part of an insect's body, which contains the digestive and reproductive organs. |
| animal | A many-celled organism which eats other living or once-living things and can move. |
| arthropod | An invertebrate with a three-part body, jointed legs, and a hard outer shell called an exoskeleton. |
| bivalve | A mollusk with two shells. Includes clams and oysters. |
| cephalopod | A mollusk with no shell or an inside shell. Includes octopuses and squid. |
| classify | To sort things into groups according to their traits. |
| colony | A group of the same kind of organisms living and growing together. |
| echinoderm | Phylum of small, slow, spiny-skinned animals with no brain which live underwater and have a stiff inside skeleton. |
| exoskeleton | A hard, light, outside skeleton or shell which all insects have. |
| gastropod | A group of mollusks with one shell, which includes the snail and slug. |
| hermaphrodite | Both male and female at the same time. |
| invertebrate | An animal with no backbone. |
| larva | Newly hatched young which are very different in appearance from the adults |
| mantle | The part of a mollusk's body which protects the organs and makes the shell. |
| molt | To shed an outer body covering, such as an exoskeleton. |
| pore | A small opening in the surface of an animal. |
| stinging cell | A cell in the body of cnidarians which has a long barbed thread, sometimes poisoned. |
| taxonomy | The science of classifying organisms. |
| thorax | The middle part of an insect's body, to which the legs are attached. |
| tube foot | Starfish use these to move. |
