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chapter 4 test 8th g

QuestionAnswer
geologic timeline division of Earth's history into time units based on the types of life-forms that lived only during certain periods; consists of periods, epochs, eras, and eons
eon longest geologic time unit; based on abundance of fossils
era time unit based on major, striking and world-wide changes in types of fossils present
period time unit characterized by types of life existing world-wide a the time
epoch shortest geologic time unit; based on difference in life forms that vary regionally, such as from continent to continent
organic evolution theory that species have changed over time
natural selection theory proposed by Charled Darwin to explain how species change over time
species groups of organisms that normally reproduces only with other members of their own group
artificial selection breeding of a certain species by humans for desired traits
trilobites-differences from beginning to end trilobites eyes changed over time 3 sediment bodied organismd used as an index fossil
pangaea supercontinent
precambrian time longest time of Earth's history and includes the Kladeann, Archean, and Proterozoic eons devolopment of the ozone layer, lttle is known
precambrian time organisms cyanobacteria, jelly fish, ediacaran fauna, worms,soft corals
paloezoic era era of ancient life appalachian mountains formed, mass extinction at end because of pangaea
paloezoic era organisms vertebrates, trilobite, fish, amphibians, reptiles
Mesozoic era era of "middle life"
Mesozoic era organisms dinosaurs, birds, angiosperms, mammals
Cenozoic Era most recent era; the era we live in; the era of recent life
Cenozoic Era organisms homosapiens
when did mammals first appear (era and period) Mesozoic Era; Triassic Period
without the development of __________ complex organisms couldn't have existed ozone layer
The formation of pangaea changed Earth's ______ climate
Created by: kmm0602
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