Rosemary and peter grant of princeton university have studied finches on the galapagos islands since 1973. they found that when drought conditions on the islands increased, the seeds produced by some of the plants that provided food for the finches were affected. the drought decreased the supply of plants that produced easily cracked seeds, but permitted the survival of plants that produced larger, tougher seeds. only finches with strong, wide beaks could break open the tougher seeds. w

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Explanation:

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.