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 correct answer would be a. tag all individuals during the first study to ensure accurate results.

In ecology, mark and recapture or tagging is the process used to estimate the population size of an animal.

In this process, a small portion of the population is captured for marking after which they are released.

Another portion of the population is captured later for marking. The number of animals which are already marked is counted which gives the estimation of the actual size of the population.