When tagging animals specifically for the study of population size, scientists must do all of the following EXCEPT:

In a mark-and-recapture study, scientists tag a sample of animals during the first capture, not every individual in the population. They should make sure tags do not harm animals, are non-toxic and stay attached, and do not make animals easier for predators to notice. Therefore, the exception is “tag all individuals during the first study to ensure accurate results.”

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