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What is life?

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
cell   The basic unit of structure and function in living things.  
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organism   a living thing  
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unicellular   Single-celled organisms, like bacteria.  
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Multicellular   organisms that are composed with many cells.  
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Metabolism   The combination of chemical reactions through which an organism builds up or breaks down materials.  
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Stimulus   A change in an organisms surroundings that causes the organism to react.  
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response   An action or a change in behavior.  
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development   The process of change that occurs during an organism's life.  
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asexual reproduction   one parent produces offspring that are identical to the parent.  
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sexual reproduction   two parents combines their genetic material to produce a new organism that differs from both parents.  
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spontaneous generation   Living things can arise from nonliving sources.  
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controlled experiment   A scientist carries out a series of tests that are identical in every respect except for one factor.  
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autograph   organism's make their own food.  
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heterotroph   organisms that can not make their own food.  
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homeostasis   The maintenance of stable internal conditions.  
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