| A | B |
|---|
| organisms | living things |
| cell | the basic unit of structure and function in an organism |
| unicellular | single-celled organisms |
| multicellular | organisms made up of many cells |
| metabolism | combination of chemical reactions through which an organism builds up or breaks down materials |
| stimulus | a change in an organisms surroundings that causes the organism to react |
| response | an action or change in behavior |
| development | the process of change that occurs during an organisms life producing a more complex organism |
| asexual reproduction | involves only one parent and produces offspring that are identical to the parent |
| sexual reproduction | involves two parents and combines their genetic material to produce a new organism that differs from both parents |
| spontaneous generation | the mistaken idea that organisms can arise from nonliving sourcces |
| controlled experiment | a series of tests that are identical in every aspect except for one factor |
| autotrophs | organisms that make their own food |
| heterotrophs | organisms that can not make their own food |
| homeostasis | the maintenance of stable internal conditions |
