The concentration of oxygen in the blood that flows through the lungs is always higher then the concentration of oxygen in the alveoli. Why is this important?

In general, are there any major differences that you can see? explain

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .

Does anyone know what the schooling version of sos mean? example