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Option 3 : 3

The error here is due to the wrong conjunction being used here.

‘or’ must be replaced with ‘and’. Since both rates are estimated, ‘and’ must be used. ‘or’ suggests ‘choices’ in which one is chosen and other is discarded. ‘and’ is used to connect similar things.

Correct sentence- ‘Researchers from Indian Institute of Science Education and Research (IISER) Pune propose a change in the way epidemiologists estimate the growth and adaptation rate of bacteria.

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