3. which statement best describes the richter scale? a. it's a test given to all geologists. b. it's a numerical system that measures the smallest seismic waves during an earthquake. c. it's a numerical rating system that measures the largest seismic waves during an earthquake. d. it's named after a scientist who studied tornadoes.

your spelling is a little off : ]

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.