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Some eukaryotes swallowed sunlight-using-bacteria. Instead of eating them they kept them alive. They could now use sunlight to make food and get energy. At night they still burnt food with their mitochondria, like a protozoan. These were the simplest plants, called algae ("al-jee"). One of these is called an alga ("al-ga"). They first appeared around 1.5 billion years ago.
Biologists classify algae as belonging to the Protista. |
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Biological Environment > Algae
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Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
