Which type of instructional note is used in the tabular list of diseases to identify a code for a condition that is a manifestation of an underlying disease?

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

b is the answer and if you need further with anything message me