| A | B |
|---|
| organism | a living thing |
| cell | basic unit of structure and function in an organism |
| unicellular | made of a single cell |
| multicellualr | consisting of many cells |
| stimulus | change in an organism’s surroundings that causes the organism to react |
| response | action or change in behavior that occurs as a result of a stimulus |
| development | process of change that occurs during an organism’s life to produce a more complex organism |
| spontaneous generation | mistaken idea that living things arise from nonliving sources |
| autotroph | organism that makes its own food |
| heterotroph | organism that cannot make its own food |
| homeostasis | maintenance of stable internal conditions |
| microscope | instrument that makes small objects look larger |
| cell theory | widely accepted explanation of the relationship between cells and living things |
