Birds that arrive early might survive better than birds that arrive later why

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Explanation:

In summary, early arrival of migratory birds on breeding grounds can potentially lead to higher reproductive success solely as a result of the greater time available for laying replacement clutches, should early nesting attempts fail.

The benefits of early arrival are greatest when nest survival rates are constant or ... Why do earlier‐arriving migratory birds have better breeding ... arrival date may be a correlate, rather than the driver ...

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explanation:

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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.