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Plastid Endosymbiosis in algae and diatoms

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Mitochondria and chloroplasts are actually bacterial symbionts that live wrapped up in the outer cell membrane. The diagram shows how they formed from a unicellular ancestor that had a mitochondrial endosymbiont already. Some diatoms formed by the cell engulfing an algal cell and are made of up to 5 different organisms . This happened sometime during the Precambrian. This is an evolutionary process that has actually been observed in living organisms!
Multicellular land plants are evolved from green algae .

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The book “Life On A Young Planet” by Andrew Knoll is about life during the Precambrian billions of years before the Cambrian Explosion
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