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| The scientific study of living organisms and their interactions with the environment. |
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| In biology, the smallest unit that can perform all life processes; cells are covered by a membrane and have a nucleus and cytoplasm. |
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| The process of producing offspring. |
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| The sum of all chemical processes that occur in an organism. |
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| The maintenance of a constant internal state in a changing environment; a constant internal state that is maintained in a changing environment by continually making adjustments to the environment. |
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| A segment of DNA that is located in a chromosome and that codes for a specific hereditary trait. |
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| The passing of genetic traits from parent to offspring. |
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| A change in the nucleotide-base sequence gene or DNA molecule. |
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| A change in the characteristics of a population from one generation to the next; the gradual development of organisms from other organisms since the beginnings of life. |
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| A group of organisms that are closely related and naturally mate to produce fertile offspring; also the level of classification below genus and above subspecies. |
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| The process in which individuals that have favorable variations and are better adapted to their environment survive and reproduce more successfully than less well adapted individuals. |
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