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What Is Life?

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Term
Definition
organism   a living thing  
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cell   the basic unit of function and structure in living things  
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unicellular   made of a single cell  
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multicellular   consisting of many cells  
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metabolism   the combinations of chemical reactions through which an organism breaks down or builds up materials.  
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stimulus   Any change or signal in the environment that can make an organism react in some way.  
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response   An action or change in behavior that occurs as a result of a stimulus.  
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development   the process of change that occurs during an organisms life to produce a more complex organism.  
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asexual reproduction   A reproduction process that involves only one parent and produces offspring that are genetically identical to to the parent.  
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sexual reproduction   A reproduction process that involves two parents that combine their genetic materials to produce a new organism which differs from both parents.  
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spontaneous generation   the mistaken idea that living things arise from non-living sources.  
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controlled experiment   an experiment in which only one variable is manipulated at a time.  
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autotroph   An organism that is able to capture energy from sunlight or chemicals and use it to produce it's own food.  
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heterotroph   An organism that cannot make it's own food and gets food by consuming other animals.  
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homeostatis   the condition in which an organism's internal environment is kept stable in spite of changes in it's external environment.  
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