Assuming you inhale through your nose, list the pathway a molecule of oxygen would follow starting with inhalation and ending with diffusion to a muscle fiber. List all the structures the O2 molecule passes through in the respiratory and circulatory systems, including the types of blood vessels, as it makes its way to a muscle cell. (Excluding Valves)

idk why hjggjhjkhj

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.

answeranovulation;

answerhomologous structures;