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17 Cards in this Set

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radiomatic dating
estimation of the age of object by measuring it's content of certain radioactive isotopes
radioisotopes
unstable isotopes that break down and give off energy in the form of charged particles(radiation)
Half life
the time it takes for one half of a given amount of a radioisotope to decay
microspheres
short chains of amino acids that gather into tiny droplets
fossil
preserved or mineralized remains (bone tooth or shell) or imprint of an organism that lived long ago
cyanobacteria
photosynthetic prokaryotes 1st prokaryotes to appear
eubacteria
prokaryotes that contain a chemical called peptidoglycan in their cell wall
archaebacteria
prokaryotes that Lack peptidoglycan in cell walls and have unique lipid in cell membrane
endosymbiosis
theory that mitochonria are decendents of symbiotic aerobic eubacteria and chloroplasts are descendenta of symbiotic photosynthetic eubacteria
protists
Large group that includes both multicellular and unicellular organisms
extinction
death of all members of a species
mass extinction
episode during which large numbers of species became extinct
mycorrhizae
biological partnerships
symbiotic associations between fungi and root of plants
Continental drift
movement of the Earth's land mass over earth's surface through geologic time
mutualism
a relationship between two species which both species benefit EX plants/fungi
arhopod
an aminal with hard outer skeleton, a segmented body and paired joined limbs.
Ex lobster, crabs,spiders
vertebrate
animals with backbones