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What is Life?
| Term | Definition |
|---|---|
| unicellular | single-celled organisms |
| multicellular | organisms composed of many cells |
| cell | the basic unit of structure and function in an organism |
| stimulus | a change in an organism's surroundings that causes the organism to react |
| response | an action or change in behavior |
| development | the process of change that produces a more complex organism |
| growth | the process of becoming larger |
| spontaneous generation | the mistaken idea that living things can arise from non-living sources |
| water | all living things must have this to survive |
| autotrophs | organisms that make their own food |
| heterotrophs | organisms that cannot make their own food |
| homeostasis | stable internal conditions |