论文部分内容阅读
蛇的祖先不是水生爬行动物,而是有脚的陆地爬行动物,它们的脚是在进化过程中为适应干燥的陆地生活而逐渐消失的。
Snake's ancestors are not aquatic reptiles, but footed land reptiles, their feet are gradually evolving to adapt to dry land life and disappear.