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7. Why do scientists think that photosynthetic prokaryotes were probably not the first life forms on Earth?

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SoapyMcTavishid
Microbes were the first inhabitants of Earth. They are single-celled organisms, like bacteria, fungi, and protozoa. Microbes are still found just about everywhere today, thriving in boiling hot thermal springs 
Hope this Helps :D 
because photosynthesis is  Four stage sequence of how life first developed on Earth way in the being of time small organic molecules 

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