Which perspective (or subfield) of psychology focuses on answering questions like, "to what extent are traits like personality or sexual orientation something we are born with (d. n.a.; nature) or something we learn from experience (environment; nurture).

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.

answer; motor (efferent)neurons;