When tagging animals specifically for the study of population size, scientists must do all of the following except: a. tag all individuals during the first study to ensure accurate results b. make sure that markings do not harm the animal c. ensure that tags are non-toxic and will not come off of the animal d. ensure that the location and color of the tag does not draw the attention of predators

The tagging of the animals for the purpose of the study of the population size should be done such that the markings should not harm the animals, and does not draw the attention of the predators. These markings for tagging should be non-toxic and long lasting. All of these points are necessary for the tagging of the animals as the protection of the animals is the priority. However, marking them during the first study is not needed.

Hence, the correct answer is 'Option A'.

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