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| the smallest unit capable of all life functions. |
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| the process by which organisms make more of their own kind from one generation to the next. |
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| the sum of all of the chemical reactions carried out in an organism. |
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| maintenance of stable internal conditions in spite of changes in the external environment. |
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| set of inherited instructions for making proteins; they control when proteins are made and what proteins are made. |
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| passing of traits from parent to offspring. |
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| change in the DNA of a gene is called a mutation; most are harmful, but sometimes can help an organism survive. |
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| change in the inherited traits of species over time. |
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| a group of genetically similar organisms that can produce fertile offspring. |
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| In the nineteenth century, Darwin created it as a way to explain have some animals have mutations that make them better in certain situations. |
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| the science that studies the interactions of living organisms with one another and with the nonliving part of their environment. |
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| a virus that destroys the immune system, causing acquired immune deficiency syndrome, or AIDS. |
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| a growth disorder of cells that occurs when cells divide uncontrollably within the body. |
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| a fatal disorder in which abnormally thick mucus builds up in many organs, including the lungs. |
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