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15 Cards in this Set

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