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| the theory that living organisms come only from other living organisms |
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| an early and now disproved hypothesis that living organisms develop from nonliving material |
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| a cell-like droplet formed from dissimilar substances |
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| the period of time in which half of a radioactive substance decays |
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| one of multiple forms of a chemical element that has a different number of neutrons than other atoms of that element |
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| the sum of the protons and the neutrons in an atom |
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| a type of microscopic droplet enclosed by a membrane composed of organic molecules |
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| a method of determining the age of an object by measuring the amount of a specific radioactive isotope it contains |
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| the release of particles or radiant energy by the unstable nuclei of some isotopes |
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| an isotope with an unstable nucleus |
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| a prokaryotic organism distinguished from other prokaryotes by the composition of the cell membranes and walls |
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| the production of carbohydrates through the use of energy from inorganic molecules instead of light |
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| photosynthetic unicellular prokaryotes |
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| a mutually beneficial relationship between one organism and another that lives within it; the hypothesis of endosymbiosis relating to the evolution of eukaryotes that holds that chloroplasts and mitochondria evolved from endosymbiotic bacteria |
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| a molecule composed of three atoms of oxygen; ozone in the upper atmosphere shields the Earth from ultraviolet radiation |
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| a type of RNA that is able to act as an enzyme |
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