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| The estimation of the age of an object by measuring its content radioactive isotopes. |
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A form of an element whose atomic mass (the massof each individual atom) differs from that of other atoms of the same element. |
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| radioisotopes or radioactive isotopes |
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| Are unstable isotopes that break down and give off energy in the form of charged particles (radiation). |
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| (breakdown) results in other isotopes that are smaller and more stable. |
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| (radioisotopes) half-life |
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| the time it takes for one-half of a given amount of radioisotope to decay. |
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| short chains of amino acids can gather into tiny droplets. |
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| is composed of molecules of different types, including linked amino acids and sugars. |
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| is the preserved or mineralized remains (bone, tooth, or shell) or imprint of an organism that lived long ago. |
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| are photosynthetic prokaryotes. |
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| are prokaryotes that cotain a chemical called peptidoglycan in their cell walls. Also includes many bacteria that cause diseaes and decay. |
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| are prokaryotes that lack peptioglycan in their cell walls and have unique lipids in their cell membranes. |
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| which carry out photosynthesis, are found only in protists and plants. |
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| a mutually benefical relationship in which one organism lives within another. |
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| an organism that belongs to the kingdom Protista. |
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| is the death of all members of a species. |
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| is an episode during which large numbers of species becomes extinct. |
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| are symbiotic associations between fungi and the roots of plants. |
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| is a relationship between two species in which both species benefit. |
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is a kind of abimal with a hard outer skeleton, a segmented body, and paired, jointed limbs. (lobsters, crabs, insects and spiders) |
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| is an animal with a backbone ( most familiar to us) |
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| is movement of Earths land masses over Earths surface through geologic time. |
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