Key events for the Precambrian, which makes up about 85 percent of the Earth's history, are:?

a. cooling and formation of contoinental plated, primitives photosynthesis, free oxygen, primordial life forms, and formation of the Earth with widespread volcanic activity and meteorite bombardment.

b. rise and fall of sea levels several times, development of marine life and fishes, amphibians, and reptiles, formation of super-continent Pangaea.

c. age of reptiles, diverse land plants, ending with possible large meteor causeing " nuclear winter" and extinction of dinosaurs; initial breakup of Pangaea

d. age of mammals; alternate ice ages and warming periods with periods od glaciation

Key events for the Precambrian, which makes up about 85 percent of the Earth's history, are:?amc theater

a. cooling and formation of contoinental plated, primitives photosynthesis, free oxygen, primordial life forms, and formation of the Earth with widespread volcanic activity and meteorite bombardment.

Key events for the Precambrian, which makes up about 85 percent of the Earth&#039;s history, are:?

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Key events for the Precambrian, which makes up about 85 percent of the Earth's history, are:?