Which of the following is/are a source of variation in insect color?

i believe the answer would be b. hope it : )

im not intirely sure but i think the anwser is d relative humidity

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.