| Term | Definition |
| adaptation | a special trait that helps an organism survive |
| endangered species | a species threatened with extinction |
| extinct | no longer alive on earth |
| thriving | growing well; flourishing |
| traits | characteristics of a living thing |
| competition | the act of competing; contest; match |
| ecosystem | the living and non-living things in an environment and all their interactions |
| threatened | having an uncertain chance of survival; likely to become endangered |
| complete metamorphosis | a total change in body form (stages are: egg larva, pupa, adult) ex. buttlerfly |
| incomplete metamorphosis | change that is not complete because nymph stage resembles the adult stage (stages are: egg, nymph, adult) ex. termite |
| stem | part of a plant that carries food, water, and other materials to and from the roots and leaves |
| leaves | part of the plant that makes most of the plant's food |
| root | part of the plant that takes in water and other materials a plant needs to make food |
| tuber | a short fleshy underground stem (ex. potato) |
| flower | the part of the plant where reproduction occurs |