The first organism which appeared on Earth's surface was a kind of plant. Blue-green algae used sunlight and water to make food, and in the process, created oxygen. That's what all plants do: they make their own food out of nothing and the waste they produce is oxygen! It makes it possible for all other types of organisms to develop. Plants play the most important part in the cycle of nature. Without plants, there could be no life on Earth, nor on Mars...
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