How do evaporation fogs differ from other types of fog?

Evaporation fogs are created when water vapor is added to the air.

Evaporation fog is a type of advection fog. It forms when cool air hovers over a warm body of water. The water molecules are rapidly humidified after it evaporates from the surface of the water to the cold air above.

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.