The idea that, once populations are separated, change toward speciation occurs in them only slowly and over long periods of time is called

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

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.