| A | B |
|---|
| organism | a living thing |
| cell | the basic unit of living things |
| unicellular | consists of a single cell |
| multicellular | consists of many cells |
| metabolism | the combination of chemical reactions through which an organism builds up or breaks down materials |
| stimulus | any change in the environment that causes a reaction |
| response | an action that occurs as a result of a stimulus |
| development | the process of change that occurs during an organism's life |
| asexual reproduction | reproductive process that involves only one parent |
| sexual reproduction | reproductive process that involves two parents whose DNA is combined |
| spontaneous generation | mistaken idea that living things arise from nonliving sources |
| controlled experiment | an experiment in which only one variable is manipulated at a time |
| autotroph | an organism that is able to capture energy from sunlight to produce food |
| heterotroph | an organism that must eat other organisms for food |
| louis pasteur | french chemist who disproved spontaneous generation using bacteria |
| francesco redi | Italian doctor who disproved spontaneous generation using meat and flies |
| homeostasis | the condition in which an organism's internal environment stays consistent despite changes to the external environment |
