What motivates farmers to add more cows to the pasture?

more cows means the farmers will have a higher rate of income of dairy goods.  With more dairy goods from the cows, the farmers will be able to make more money and they will be able to make a profit greater than the cost of buying the cows.

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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