| A | B |
|---|
| organism | a living thing |
| homeostasis | the maintenance of stable internal conditions despite changes in the surroundings; ability to maintain a fairly constant body temperature, despite changes in the outside temperature |
| unicellular | single-celled organisms; an organism that is made up of a single (just one) cell |
| multicellular | many-celled organisms; an organism that is made up of many cells |
| development | the process of change that occurs during an organism's life to produce a more complex organism; when living things get bigger and become more complex |
| stimulus | a change in an organism's surroundings that causes the organism to react; any change in environment |
| response | an action or change in behavior that occurs as a result of a stimulus; action, movement, or change in behavior of an organism to a stimulus |
| reproduce | to produce offspring that are similar to the parents |
| asexual reproduction | a reproductive process that involves only one parent |
| sexual reproduction | a reproductive process that usually requires two parents who combine their genetic material to produce a new organism |
| spontaneous generation | the mistaken idea that living things arise from nonliving sources |
| controlled experiment | an experiment in which a scientist carries out two tests that are identical in every aspect except for one factor |
| manipulated variable | the one factor that the scientist changes during an experiment |
| autotrophs | organisms that make their own food |
| cell | the basic unit of structure and function in an organism; basic building block of living things |
