Both the moon and the sun influence earth. the moon has a much greater influence though. why is that?
a) because the sun is less dense
b) because the sun is gaseous, not solid
c) because the sun is so far away from earth
d) because the sun is less massive than the moon

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

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.