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The microorganisms present on day 5 were

(1) newly added from the sterile culture medium

(2) offspring of antibiotic-resistant individuals

(3) organisms that were all present on day 1

(4) offspring with no resistance to the antibiotic

Verified Answer :

The microorganisms present on day 5 were "(4) offspring with no resistance to the antibiotic" since antibiotics would have eliminated an unfit contenders. 

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