Question

what happened with out usefull microorganism are not
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Answer 1

Answer:

All plants would die

If they don't have microbes to take in and convert important chemical compounds into usable parts, they'll rapidly lose to ability to produce fuel via photosynthesis and will quickly die

Answer 2

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All plants would die ✔️

If they don't have microbes to take in and convert important chemical compounds into usable parts, they'll rapidly lose to ability to produce fuel via photosynthesis and will quickly die.

Hope it helps ♥️