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In the beginning the Earth started as a molten ball of rock, which formed about 4.6 billion years ago and took at least 600 million years to cool. The very first living organisms were microscopic bacteria that appeared 3.5 billion years ago. Next, the bacteria probably evolved to life in the sea, such as corals, fish, shellfish, and the ancestors of crabs. The very first fish and vertebrate was the Pikaia. After that the fish formed into amphibians, or a type of animal that spent part of its life in water, and part of its life on land. Finally, about 320 million years ago, in the Permian time period, reptiles were formed. Next, was the Mesozoic era also known as the Age of the Dinosaurs. The Mesozoic era has three time periods, which includes the Triassic period, the Jurassic period, and the Cretaceous period.
The first period was the Triassic period that lasted from 205 million years ago to 250 million years ago, and had the first dinosaurs. The Earth looked different......

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Approximate Pages: 4 (250 words per double-spaced page)

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