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| an organized way of using evidence to learn about the natural world |
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| a logical interpretation based on prior knowledge and experience |
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| a possible explanation for a set of observations or an answer to a scientific question |
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| an idea that life could arise from nonliving matter |
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| whenever possible, a hypothesis should be tested by an experiment in which only one variable is changed at a time all other variables should be kept unchanged or controlled |
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| the variable that is observed and that changes in response to the manipulated variable |
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| the science that seeks to understand the living world |
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| two cells from different parents unite to produce the first cell of the new organism |
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| the new organism has a single parent in some forms a single celled organism divides in half to form two new organisms, sometimes a portion of an organism splits off to form a new organism |
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| the combination of chemical reactions through which an organism builds up or breaks down materials as it carries out its life procisses |
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| the process by which organisms keep their internal conditions relatively stable |
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| devices that produce magnified images of structures that are too small to see with the unaided eye |
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| compound light microscopes |
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| allow light to pass through the specimens of dead organisms or their parts they also make it possible to observe some tiny organisms and cells while they are still alive |
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| focus beams of electrons on specimens can form images of objects 1000 times smalled than those visible under a light microscope |
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| developes from the single original cell, can be used to test cell responsesunder controlled conditions, to study interactions between cells and to select specific cells for further study |
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| to separate different cell parts |
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