How many prokaryotic species might there be according to biologists?

How many prokaryotic species might there be according to biologists?
  1. Thousands
  2. Millions
  3. Billions
  4. No one knows

Solution

Biologists are not sure about the number of prokaryotic species as conventional taxonomic methods are not suitable for identifying microbial species and many species are not culturable under laboratory conditions.

Asked in: NCERT

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