history of life on earth
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Created by:
yankeegirl00 on January 15, 2011
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17 terms
Terms | Definitions |
|---|---|
 radiometric dating | the estimate of the age or an old content |
| radioisotopes | unstable isotopes that can break down energy an give off energy in a form of charged particles |
| half-life | the time it takes one-half of the remains to decay |
| microspheres | water molecules or short chains of amino acids that can form tiny droplets |
| fossil | the preserved remains of an old object ex(tooth,shell,bones) |
| cyanobacteria | photosynthetic prokaryotes |
| eubacteria | prokaryotes that contain a chemical called peptidoglycan thats in cell walls |
| archabacteria | prokaryotes that lack in their call walls peptidoglycan and have unique lipids in cell membranes |
| endosymbosis | is a theory that describes that mitochondria and chloroplasts originated |
| protists | make up large groups that vary both multicellular and unicellular |
| extinction | where all quanties of a species no longer exists |
| mass extinction | is where more then one type or form of species no longer exists |
| mycorrhizae | fungus and plants support one another fungus provides minerials for plants and plants provide nutrients |
| mutualism | relationship between two species where they both can benifit from it |
| vertebrate | animal with a backbone ex(humans,cats,dogs) |
| arthropod | an animal with a hard body on the outside ex(beetle) |
| continental drift | the movement of land over time |
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