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Ch 14 test

vocabulary

QuestionAnswer
Cenozioc Era era of recent life that began 66 million years ago and cntinues today; including the first apperance of Homo Sapiens about 400,000 years ago.
Cynobacteria chlorophyll-containing, photosyntheitic bacteria thought to be one of earth's earlieast life forms.
Eon longest subdivision in the geologic time scale that is based on the abundance of certain types of fossils and is subdivided into eras, periods, and epochs.
Epoch next smaller division in the geologic time after the period; is characterized by differences in the life forms that may vary regionally.
Era secound longest division of geologic time; is subdivided into periods and is based on major worldwide changes in types of fossils
Geologic Time Scale division of Earth's history into time units based largely on the types of life-forms that lived during certain periods
Mesozoic Era middle era os Earth's history, during which Pangea broke apart, dinosaurs apperead, and reptiles and gymnosperms were the dominant land life-forms.
Ntural Selection process by which organisms that are suited to a particular enviroment are better able to survivie and reproduce that organisms that are not.
Organic Evolution change of organisms over geologic time
Paleozoic Era era os ancient life, which began about 544 milion years ago, when organisms developed hard parts, and ended with mass extinctions about 245 million years ago.
Pangea large ancient landmass that was composed of all continents joined together.
Period third longest division of geologic time; is subdivded by Epochs, and is characterized by the types of life that existed worlwide.
Precambrian Time longest part of Earth's history, lasting from 4.0 billion to about 544 million years ago.
Species group of organsims that reproduces only with the members of their own group.
Trilobite organism with a three-lobed exoskeleton that was abundant in Paleozoic oceans and considered to be an index fossil.
Created by: finchelfan2999
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