| A | B |
|---|
| spontaneous generation | theory that life came from non-living matter |
| metabolism | all chemical activities that occur in an organism |
| ingestion | taking in food or nutrients |
| digestion | food broken down into simpler substances |
| respiration | organisms take in oxygen and use it for energy |
| excretion | process of getting rid of wastes |
| life span | maximum length of time an organism can be expected to live |
| stimulus | signal to which an organism reacts |
| response | some action brought on by a stimulus |
| homeostasis | ability of an organism to keep conditions inside the body the same |
