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5 Cards in this Set
- Front
- Back
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half-life
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The time required for one-half of the original quantity of radioactive atoms to decay.
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natural selection
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1) Any given species produces more organisms than can survive to maturity 2) Variation exists among offspring 3) Offspring must compete for food and habitat 4) Those individuals with the most favorable variations are most likely to survive.
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scientific law
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A theory that stands the test of time.
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theory
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A hypothesis that survives repeated challenges and is supported by accumulating favoriable evidence.
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absolute age
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Actual age of a rock in years, done by radiometric dating.
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