Erythropoietin (EPO), a hormone produced by the kidneys, is released into the blood when blood oxygen levels are low. EPO stimul
ates the production of erythrocytes by red bone marrow. If an individual spends a considerable amount of time at high altitudes where atmospheric oxygen is reduced, the levels of EPO would be __________________(normal/higher/lower) than in comparison to living at sea level.
You can't really expect to find water stored as a gas, as it cools to a liquid at room temperature. You could easily find evaporated water on a stovetop by boiling water, though.
