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Ch.12 VOCAB

vocab

TermDefinition
relative dating estimate of the age of a fossil based on the location of fossils in strata
radiometric dating technique that measures the natural decay rate of isotopes to calculate the age of material
isotope form of an element w/the same # of protons but diff # of nuetrons as another element
half-life amount of time it takes for half of the isotope in a sample to decay into its product isotope
index fossil fossil of an organism that existed during only specific spans of geologic time across large geographic areas
geologic time scale time scale representing the history of earth
era 2nd largest unit of time, lasts tens-hundreds of million years, consists of 2+ periods
period unit of geological tim that lasts tens of million years
epoch smallest unit of geological time, lasts seveal million years
nebula rotating cloud of gas and dust
ribozyme RNA molocule that can catalyze specific chemical reactions
cyanobacteria bacteria that can carry out photosynthesis
endosymbiosis ecological relationship in which 1 organism lives w/in the body of another
Paleozoic era where members of every major animal group alive today evolved
Cambrian explosion earliest part of Paleozoic era, when a huge diversity of animal species evolved
Mesosoic era during which dinosaurs roamed the earth
Cenozoic era that began 65 million years ago and still continues today
primate mammal w/flexible hands and feet, forward looking eyes, and enlarged brains
prosimian oldest primate group that includes mostly small, nocturnal
hominid primate that walks upright, has long limbs, thumbs that oppose the other 4 fingers, and relitivly large brain
bipedal animal that walks on 2 legs
anthropoid humanlike primate
Created by: studyingat
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