An athlete would have a larger vital capacity than a non-athlete aerobic ability would find people with larger lungs and hence a bigger vital capacity. The vital capacity of an athlete is higher than a non-athlete because they are trying to do hard work their legs to get bigger and bigger over time making it easier for them
The density of the water causes pressure, which causes water to move.
The population doesn’t grow(increase) anymore and the number of organisms stay at about that point(the carrying capacity).