History of the world By juliette frost

Archeazoic Period (Eon)

This time period was about 3.9 billion to 2.5 billion years ago. The air back then was poisonous to the human body so we would be dead. Plus the earth had just begun to cool off. The only living cell on the planet (that we know of) was a single celled bacteria, called stromatolites.

The earliest life on earth was a certain type of Eukaryote. They soon started to evolve and became dinosaurs after many years. this lead to early land plants.

The largest mass extinction was called the Permian-Triassic.

The Paleozoic Era ran from about 542 million years ago to 251 million years ago. Plants became widespread. And the first vertebrate animals colonized land.

The dinosaurs went extinct 65 million years ago. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.

The Cenozoic is called the Age of Mammals, because the largest land animals have been mammals during that time.

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Juliette
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Created with images by albertr - "dinosaur dragon tyrannosaurus" • skeeze - "molten volcano lava" • Tama66 - "death die cemetery"

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