| A | B |
|---|
| Stimulus | Change in the environment that causes an organism to react |
| Metabolism | Balance between energy producing processes and energy using processes |
| Ingestion | Taking in food |
| Respiration | Exchange of gases |
| Adaptation | A trait or characteristic that allows an organism to survive and reproduce |
| Excretion | Process of getting rid of waste materials |
| Digestion | Process by which food is broken down into simpler substances |
| Response | Action, movement, or change in behavior caused by a stimulus |
| Organism | Highest level of living thing |
| Nutrition | Needed by living things to grow, develop, and repair body parts |
| Endothermic | Maintain a constant body temperature (warm blooded) |
| Ectothermic | Body temperatures change with the environment (cold blooded) |
| Cell | Most basic level of all living things |
| Limiting factors | An environmental factor that affects an organisms survival (ex. forest fire) |
| Tissue | A group of cells working together |
| Organ | Cells and tissues form these in an organism |
| Reproduction | Making more of oneself |
| Unicellular | one celled organism |
| Mulitcellular | many celled organisms |
| Competition | Simultaneous demand by one or more organisms for limited environmental resources |
