| A | B |
| sessile | an organism that is attached to and stays in one place |
| cheliped | the first pair of legs, which has large claws to trap and crush food |
| swimmeret | crustacean appendage that aids in swimming, balance, and egg attachment |
| chelicera | one of a pair of arachnid appendages modified to function as fangs or pincers |
| pedipalp | one of a pair of arachnid appendages used for sensing and holding prey and in male spiders used for reproduction |
| spinneret | the structure in spiders that spins silk from a fluid protein secreted by their glands |
| pollen | a fine powder produced by certain plants when they reproduce |
| metamorphosis | the series of changes from a larval form to an adult form |
| pupa | nonfeeding stage of complete metamorphosis in which the insect changes from the larval form to the adult form |
| nymph | immature form of an insect during incomplete metamorphosis - the hatchling looks like a small adult insect insect and goes through several molts, eventually becoming a mature winged adult |
| caste | specialized group of individuals in an insect society that performs specific tasks |