Over 3,000 million years ago, the first living-organism which resembled a plant appeared. It was a blue-green algae which lived in the sea and can still be found in the water today. When the plants made their first appearance on Planet Earth the atmosphere was unlivable for all oxygen breathing creatures. The air was made out of carbon dioxide, a gas which to us is deadly. Then photosynthetic plants came along and slowly over several million years, cleaned the atmosphere and filled it with oxygen.
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