The graph below illustrates the results of an investigation using newborn rats. The dashed line curve shows the normal growth rate of rats, based on previous investigations. The solid-line curve shows the growth rate of 50 rats that were fed a normal diet containing nutrients A and B until they reached an age of 80 days (point X). At point X, the amounts of nutrients A and B were increased. At point Y, nutrient A was returned to the normal amount. At point Z, nutrient B was returned to the normal amount. According to the graph, at what age do rats normally reach a stable weight?

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

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