The skeletal and muscular system of the amphibians

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How is the skeletal and muscular system of the amphibians adapted for life on land? How would a buccal pump be more important for an active amphibian or one who is becoming inactive during the winter? explain your answer. why is the separation of oxygenated and non​-oxygenated blood in the heart is not as important for amphibians as it is for terrestrial vertebrates?