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Of all the microbes on Earth, only about this many have been identified.

Question 1:

Of all the microbes on Earth, only about this many have been identified.

A. 1 %

B. 5 %

C. 2 %

D. 10 %

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Trivial Practice Quiz science-technology - Test 36 | Englishfreetest.com

30 minutes
15 questions