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7th Chapter 1
Living Things
Term | Definition |
---|---|
organism | living things |
cell | basic unit of structure and function in an organism |
unicellular | a single celled organism |
multicellular | organisms composed of many cells |
stimulus | a change in an organisms surrounding that causes the organism to react |
response | an organism reacts to stimulus with a change in behavior |
development | the process of change that occurs during an organisms life to produce more complex organisms |
spontaneous generation | mistaken idea that living things that can arise from nonliving sources |
controlled experiment | a scientist carries out two tests that are identical in every respect except for one factor |
autotroph | organisms that make their own food |
heterotroph | organisms that cannot make their own food |
homeostasis | the ability to maintain stable internal conditions |
nucleus | a dense area in the cell that contains nucleic acids. The brain of the cell |
prokaryote | organisms whose cells lack a nucleus |
eukaryote | organisms with cells that contain nuclei |