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earth's history

geologic time scalea record of life forms and geological events in Earth's history
index fossila fossil that is characteristic of a particular area
eras time between Precambrian time and the present
periodseras are subdivided into units of geologic time
invertebrateanimals without backbones
vertebrateanimals with backbones
amphibiansanimal that lives part of its life on land and part in water
reptileshave scaly skin and lay eggs
Pangaeathe great landmass that formed when the Earth's continents formed together

Miss Horan

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