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Bio Vocab

Chapter 14

TermDefinition
Geologic Time Scale model showing major geological and biological events in Earth's history
era largest division of geologic time scale; it is divided into smaller parts
fossil preserved evidence of an organism that shows evidence of past life; 4 types
Cambrian Explosion a time during the Paleozoic Era when there was rapid diversification of most major animal groups
Endiosymbiont Theory eukaryiotic cells may have evolved from prokaryotic cells
biogenesis (Theory of Biogenesis) only living organisms can produce other living organisms
spontaneous generation the idea that life comes from non-living things (fly experiment)
period subdivision of "era" on the Geologic Time Scale
Paleontologist scientist who studies fossils
relative dating method of dating fossil by comparing it to the rock layers around it
radiometric dating determining the age of a fossil or rock by measuring age using the rate of decay of radioactive isotopesh
half-life amount of time for half of a radioactive isotope to decay
plate tectonics geologic theory that Earth's surface is divided into huge land masses that move around on magma
K-T Boundary layer of indium rich material between rocks in the Creataceous and Paleogene periods that provide edidence of a meteor impact
Law of Superposition oldest layers of rock are at the bottom and the newer ones are on top
Trace fossil an imprint, like foot prints
Molds & casts mold of the outside is then filled with minerals/rock to make a cast or copy
Replacement fossil copies of the insides of the organism
Petrified fossil organism is turned to stone when minerals gradually replace it. (petrified wood)
Amber/preserved remains Tree sap hardens and catches and preserves small organisms. (like mosquito in Jurassic Pk)
Preserved remains organism trapped in amber or tar or ice
Original material actual bones or the "Ice Man"
Created by: Judith_Johnson
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