青蛙从幼体到成体,不可能出现的变化是A．鳃消失B．长出四肢C．尾消失D．体表出现鳞片-八年级生物

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• 、连线题（4分）动物能进行各种有利于个体生存和繁殖的活动。请将以下相关的内容连线。-八年级生物
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