两栖动物
两栖动物（学名：Amphibia），又名两生动物，包括所有生呒卵壳个卵，拥有四肢个脊椎动物。两栖动物个皮肤裸露，表面呒鳞片、毛发等覆盖，但是可以分泌黏液以保持身体个湿润；渠个幼体拉水中生活，用鳃进行呼吸，长大后用肺搭皮肤呼吸。
老早迷齿亚纲、壳椎亚纲也㓰拉两栖生物里向，现在发现前者（譬方鱼石螈）是鱼类搭两栖类个过渡类群，后者更加接近羊膜动物（归爬行类）。
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