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precambrian era, paleozoic era, mesozoics era, cenozoic era
Precambrian
precambrian
90
Mesozoic era: Tyrannosaurus Rex lived.End of the Paleozoic era: The largest mass extinction happened.Paleozoic era: Life exploded for the first time.End of the Mesozoic era: The Chicxulub crater formed.Mesozoic era: The dinosaurs became common.End of the Paleozoic era: 95 percent of species died out.Paleozoic era: Land-based animals first became common.End of the Mesozoic era: Dinosaurs became suddenly extinct.A.PrecambrianWhen life first flourished on EarthB.MesozoicThe era before the current oneC.PaleozoicThe first eraD.CenozoicThe current era
precambrian era, paleozoic era, mesozoics era, cenozoic era
precambrian era
The precambrian era lasted from roughly 4.57 Ga to 0.54 Ga before today, equalling about 88 % of Earth's history.
Precambrian
Most of Earth's history has occurred in the Precambrian Era, a time span of over 4 billion years.
Precambrian
unicellular organisms are earliest forms of life
There are so far 4 Eras in the earths history. the one that started the beginning if the earths history: Precambrian Time. The one after that was the Paleozoic Era, which means "ancient life." next was mesozoic which means "middle life" the one we are in is called the Cenozoic Era which means" recent life." * All Eras ended with a mass extinction.
precambrian
Over most of Precambrian time 80 percent of earths history-the only life forms are bacteria ,which appear about 3,500 million years ago. multiple-cells marine animals like spriggina appear at the end of the era
Over most of Precambrian time 80 percent of earths history-the only life forms are bacteria ,which appear about 3,500 million years ago. multiple-cells marine animals like spriggina appear at the end of the era
The Precambrian Super-Eon lasted from Earths creation 4.54 billion years ago until the Cambrian Period 542 million years ago. Some 3.998 billion years. This accounts for about 88% of Earth's history.