| A | B |
|---|
| arachnid | have a head chest and abdomen, 4 pairs of legs |
| centipede | arthropod with many legs, 1 pair/segment, |
| millipede | arthropod with many legs, 2 pair / segment |
| antennae | sensory structures on arthropod's head |
| mandibles | jaws for chewing |
| insect | animals with bodies divided into three parts, a head, a chest, and abdomen |
| simple eyes | can only see light and dark |
| compound eyes | contain many lenses, can see some color, detect movement |
| complete metamorphosis | egg, larva, pupa, and adult, ex. butterfly |
| incomplete metamorphosis | egg, nymph, adult, ex. caterpillar |
| larvae | 2nd stage of complete metamorphosis |
| pupa | 3rd, stage of complete metamorphosis, is a cocoon stage |
| nymph | 2nd stage of incomplete metamorphosis, young version of adult but has no wings. |
| pheromones | powerful chemicals that insects release to communicate with each other |
