During population sampling studies, organisms are captured, tagged, counted, and then released. The correct option would be D.
This is a method of estimating the population size of a particular species of organisms.
Instead of counting the entire individual of a population which could be impossible or extremely time-consuming in most cases, the population size is estimated by randomly capturing, tagging, counting, and then releasing the captured individuals.
The procedure is repeated several times and the data is used to estimate the population size of the organism.
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When conducting a population sampling study, on the first capture attempt, we tag, count, and release the captured individuals. Thus, option "D" is correct.
This is a method commonly used in ecology to estimate the animals in the population. A portion of the population is captured, marked and released. Another part of the population will, later on, be captured. This can be used to estimate the population in an assumption that the portion that was captured is proportional to the entire population. This is obtained by dividing the number of marked individuals by the individual marked on the second capture. This is one of the simplest and most practical methods of estimating the population.
Thus, option "D" is correct.
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