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The Precambrian era began 4.6 billion years ago. Precambrian is when the earth was just forming, before the single-celled organisms appeared. One of the main life forms in the Precambrian time was the cyanobacteria

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There appeared to be no plant life during this era, due to the fact that there wasn't enough oxygen to keep the plants alive.

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Life forms usually consisted of life in the water and some of this life forms were sponges, cnidarians (jellyfish & coral) and annelids.

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mesozoic began with the mass exiticon event
it had the triassic,jurassic,and cretaceous eras
-happened 65-225 million years ago
-triassic relating to or denoting the earliest period of the Mesozoic era, between the Permian and Jurassic periods.
jurrasic -relating to or denoting the second period of the Mesozoic era, between the Triassic and Cretaceous periods.
cretacous-relating to or denoting the last period of the Mesozoic era, between the Jurassic and Tertiary periods.
The Cycadeoids ,Cyadsand , Ginkgoes. all plants that were in this time period.
dinosaurs, marine reptiles, lizards, and tortoises all animal of this period
something tragic happened was the big extinction

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- this time period happened 541 million years ago
- relating to or denoting the Precrambian era
-the plants that were around were mosses, hornworts, and fern
- animals that were around were fish, sea sponges, and trilobites
- 2 major events that happened that impacted this era were the formation of the atmosphere and the formation of sunlight.

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-Began 66 million years ago
-The name is derived from the Greek phrase meaning "recent life" and was originally spelled "Kainozoic".
-Plants like mosses, pines, oaks & grasses existed in the Cenozoic era
-Rodents and small horses, such as Hyracotherium, are common & Rhinoceroses & Elephants appear.
-The extinction of the non-avian dinosaurs and the rise of mankind.