After the end of a normal inspiration, the volume of air in the lungs is about 2.8 l. normally quiet inspiration is driven by a pressure difference of about 2 mm hg. the air in the lungs is at 37 ° c and after normal expiration it is at atmospheric pressure. quiet inspiration is driven by the expansion of the chest cavity by contraction of the diaphragm, which expands the air in the lungs. how much is the air feher, joseph j. quantitative human physiology: an introduction (academic press series in biomedical engineering) (kindle locations 3177-3180). elsevier science. kindle edition.

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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.