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| one of two or more possible forms of a character; a recognizable feature or characteristic of an organism |
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| the process of obtaining information by using the senses; the information obtained by using the senses |
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| a testable idea or explanation that leads to scientific investigation |
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| a procedure that is carried out under controlled conditions to discover, demonstrate, or test a fact, theory, or general truth |
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| in an experiment, a group that serves as a standard of comparison with another group to which the control group is identical except for one factor |
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| a system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation |
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| International System of Units, which is the measurement system that is accepted worldwide |
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| the scientific study of living organisms and their interactions with the environment |
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| highly organized, tiny structure that is enclosed in a thin covering called a membrane |
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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 internal and external environment |
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| the sum of all chemical processes that occur in an organism |
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| the process of producing offspring |
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| the passing of genetic traits from parent to offspring |
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| the process of change by which new species develop from preexisting species over time; at the genetic level, the process in which inherited characteristics within populations change over time; the process defined by Darwin as “descent with modification” |
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