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Dominant Life Form
The prevailing organisms in a particular ecosystem, characterized by their extensive presence and influence on that environment.
Reptiles
Vertebrates characterized by dry skin with horny scales and adaptations for terrestrial reproduction; include turtles, snakes, and alligators; reptiles are a paraphyletic group unless birds are included.
Eons
The largest division of geological time, comprising multiple eras, and spanning hundreds of millions to billions of years, marking significant changes in the Earth's geology and biological history.
Geologic Timescale
A system of chronological dating that relates geological strata to time, used by geologists to describe the timing and relationships of events that have occurred throughout Earth's history.
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