i need 3 one paragraph essays.

1.Explain how, in a three-chambered heart, the oxygenated blood is kept separate from the deoxygenated blood, even though both are pumped from the same ventricle.2.Compare the gill arches in marine vertebrates with the ribs in terrestrial vertebrates.3Compare the way that marine vertebrates get water to flow over the gills to how terrestrial vertebrates get air to flow into and out of the lungs.

 

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