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a)the best way to the sampling of animal population size, where impractical to count or mobile organisms is Mark and Recapture methods.
b)the mark and recapture method involves marking a number of individuals in a population, returning them to the original populations, and subsequently recapturing some of them as a basis fr estimating the size of the population at the time of marking and release. In short select individuals, mark them, release them and recapture them.it is based on the principle that if a proportion of the population was marked in some way, returned to the original populations and then, after complete mixing, a second sample was taken, the proportion of marked individuals in the second sample would be the same as the marked initially in the total population
c) The disadvantage is that accuracy does depend on capturing a large proportion of the population and the theory works by many assumptions.
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