Which statement about floodplains is true?

a) floodplains are an example of stream erosion

b) floodplains are places where the soil is infertile

c) floodplains are narrow, steep-walled, and v-shaped

d) floodplains are filled with nutrient-rich soil from deposition

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.

the answer is 100% density i've answered this question before and done the quiz myself.