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15 Cards in this Set
- Front
- Back
Mesozoic Era
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Middle era of Earth's history, during which Pangaea broke apart
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Cenozoi Era
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Era of recent life that began about 66 million years ago and continues today
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Paleozoic Era
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Era of ancient life, which began about 544 million years ago, when organisms developed hard parts, and ended with mass extinctions about 245 million years ago.
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Cyanobacteria
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One of the earliest life-forms, which gave off oxygen
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Precambrian Time
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The longest geological part of Earth's history
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Geologic Time Scale
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The division of Earth's history into time units
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Eon
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The longest subdivisons of geologic time
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Era
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Major subdivisions of geological time based on differences in life-forms
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Period
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Major divisions of an era
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Epoch
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Smaller units of time in a geologic period
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Organic Evolution
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The change in organisms over time
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Species
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A group of organisms that normally reproduce with other members of their group
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Natural Selection
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Process by which certain organisms survive and reproduce
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Trilobite
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Organisms that lived hundreds of millions of years ago with bodies divided into THREE sections
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Pangaea
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The single landmass that once contained all Earth's continents
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