When you pour liquid in a test tube, the edges of the water curve upward. This is an example of

Explanation:

When water is poured in a test tube, all the water goes to the bottom, because of gravity. When it all goes to the bottom, some of the molecules get pushed out of the way, especially in a thin, long container ( like a test tube)

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.

idk im sorry.