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From Bacteria to Plants Ch 1 Vocabulary

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Term
Definition
organism   living thing  
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cell   basic unit of structure and function in an organism  
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unicellular   single-celled organism  
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multicellular   organisms composed of many cells  
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growth   the process of becoming larger  
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development   the process of change that produces a more complex organism  
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stimulus   a change in an organism's surroundings that causes the organism to react  
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reaction   an action or change in behavior  
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reproduce   to produce offspring that are similar to the parents  
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spontaneous generation   the mistaken idea that living things arise form nonliving sources  
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controlled experiment   two test that are identical in every respect except for one factor  
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variable   the one factor that is changed in an experiment  
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autotrophs   organisms that make their own food  
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heterotrophs   organisms that cannot make their own food  
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homeostasis   the maintenance of stable internal conditions despite changes in the surroundings  
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fossils   traces of ancient organisms that have been preserved in rock or other substances  
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classification   the process of grouping things based on their similarities  
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taxonomy   the scientific study of how living things are classified  
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prokaryotes   organisms whose cells lack a nucleus  
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nucleus   a dense area in a cell that contains nucleic acids  
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eukaryotes   organisms with cells that contain nuclei  
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