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| A basic unit of structure and function in an organism |
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| A change in an organism that causes the organism to react |
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| An action or change in behavior that occurs as a result of a stimulus |
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| The process of change that occurs during an organism's life to produce a more complex organism |
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| An idea that living things come from nonliving things |
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| An experiment in which all factors are identical except 1 |
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| An organism that can feed itself |
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| An organism that can't feed itself |
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| The process of grouping things based on their similarities |
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| The scientific study of how living things are classified |
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| The system for naming organisms in which each organism is given a unique two part scientific name indicating its genus and species |
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| A classification grouping system that consists of a number of similar, closely related species |
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| Group of similar organisms that can mate |
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| The process by which species gradually change |
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| An organism that lacks a nucleus |
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| The dense area in a eukaryotic cell that contains nucleic acids, the chemical instructions that direct the cell's activities |
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| An organism whose cells contain nuclei |
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| A trace of an ancient organism that has been in a rock or other substance |
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