Question

what may happens if useful microorganisms
are not present?​

Answer 1

plants are reliant upon bacteria to survive. 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

Answer:

Without bacteria around to break down biological waste, it would build up. And dead organisms wouldn't return their nutrients back to the system. It's likely, the authors write, that most species would experience a massive drop in population, or even go extinct.

Explanation:

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