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During the development of life of the Precambrian time the first cell, known as the prokaryotic cell formed about 3.5 billion years ago. It is a very simple cell.
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This is the eukaryotic cell, it was formed about 2 billion years ago. Over time the prokaryotic cell developed and made a very complicated cell called the eukaryotic cell.
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About 600 million years ago jelly fish (like this one) have drifted along on ocean currents for millions of years. Even before dinosaurs!
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570 million years ago the Arthropods were a kind of worm that was divided into segments. The earliest arthropod on earth was here 550 million years ago.
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The first mass extinction was 544 million years ago due to an ice age. This wiped out a lot of different animal species.
this era was most known for the Cambrian explosion. It's nickname was the "time of ancient life."