In a resting person every minute 20 percent of the blood enters the

Kidney

Explanation:

Nearly 1200 ml of blood flows through kidney every minute. This amount of blood constitutes nearly 20-25% of the total blood volume in the human body which is equal to 5000 ml or five liters.  

The nephrons with in the kidneys are responsible for cleaning or filtering the blood that enters into it. It is also responsible for regulating the blood volume

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.