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13 Cards in this Set
- Front
- Back
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biogenesis
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the scientific principle that living organisms come only from other living organisms
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spontaneous generation
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an early and now disproved theory that living organisms come to life spontaneously from non living material.
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radiometric dating
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a method of derterming the absolute age of an object by comparing the rlative percentages of a radioactive isotope and a stable isotope
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mass number
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the sum of the numbers of protons and neutrons in the nucleus of an atom
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radioactive isotope
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an isotope that has an unstable nucleus and that emits radiation
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isotope
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an atom that has the same numbers of protons as other atoms of the same element do but that has a different number of neutrons
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radioactive decay
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the disintegration of an unstable atomic nucleus into one or more different nuclides, accom panied by the emmisoon of radiation
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half life
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the time required for half of a sample of a radioactive isotope to break down by a radioactive decay to form a daughter isotope
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archaea
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prokaryotes most of which are known to live in extreme conditions
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chemosynthesis
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the production of carbon hydrates through the use of energy from inorganic molecules instead of light
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cyanobacteria
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a group of bacteria that can carry out photosynthesis
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ozone
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a gas molecule that is made up of three oxygen atoms
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endosymbiosis
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a mutually beneficial relationship in which one organism lives within another
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