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| organized way of using evidence to learn about the natural world; also, the body of knowledge that scientists have built up after years of using this process |
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| use of one or more of the senses—sight, hearing, touch, smell, and sometimes taste—to gather information |
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| evidence; information gathered from observations |
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| logical interpretation based on prior knowledge and experience |
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| possible explanation for a set of observations or possible answer to a scientific question |
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| hypothesis (disproven) stating that life could arise from nonliving matter |
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| a test of the effect of a single variable by changing it while keeping all other variables the same |
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| factor in an experiment that a scientist purposely changes; also known as independent variable |
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| factor in an experiment that a scientist wants to observe, which may change in response to the manipulated variable; also known as a dependent variable |
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| well-tested explanation that unifies a broad range of observations |
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| science that seeks to understand the living world |
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| collection of living matter enclosed by a barrier that separates the cell from its surroundings; basic unit of all forms of life |
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| process by which cells from two different parents unite to produce the first cell of a new organism |
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| process by which a single parent reproduces by itself |
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| set of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes |
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| a signal to which an organism responds |
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| process by which organisms maintain a relatively stable internal environment |
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