Question: Chemical and physical properties of gases are important factors in the evolution and physiology of cardiorespiratory systems. Which of the following statements about gases and cardiorespiratory systems is TRUE? Need Assignment Help? Question options: If an air-breather's lungs filled with water, the main reason they would drown is because water has a much lower oxygen content than air. When humans climb to high altitude, they breathe more frequently to obtain sufficient oxygen and, in doing so, get rid of too much carbon dioxide, causing an alkalosis (increase in blood pH). When a frog is submerged under water, they can extend their time under water by obtaining carbon dioxide from the water across the skin. The ratio of oxygen to carbon dioxide is lower in air than in water. This is why water breathing is linked to obtaining sufficient oxygen, whereas air breathing is regulated to get rid of carbon dioxide.