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| The basic unit of structure and function in an organism. |
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| Consisting of many cells. |
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| A change in an organism’s surroundings 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 organism that makes its own food |
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| An organism that cannot make its own food. |
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| The maintenance of stable internal conditions. |
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| The mistaken idea that living things arise from nonliving sources. |
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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 that consists of a number of similar, closely related species. |
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| A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce. |
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| An organism whose cells lack a nucleus and some other cell structures. |
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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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