| A | B |
|---|
| organism | living thing |
| cell | basic unit of structure and function in an organism |
| unicellular | single-celled organism |
| multicellular | organisms made of many cells |
| stimulus | change in an organism's surroundings that causes the organism to react |
| response | action or change in behavior |
| development | process of change that occurs during an organism's life to produce a more complex organism |
| spontaneous generation | mistaken idea that living things can arise from nonliving sources |
| autotroph | organisms that make their own food |
| heterotroph | organisms that cannot make their own food |
| homeostasis | maintenance of stable internal conditions |
