海牛的生活习性.

非洲和南美洲海牛和鸵鸟的分布.海牛栖息在热带浅海环境中,鸵鸟生活在陆地上,而且不会飞,按理它们都没有远涉大洋的能力.你能解释,它们为什么会分布在大西洋的两岸呢

是不是就是因为几亿年前南美洲和非洲是一个陆地，由于漂移使得这个陆地分裂，陆地上的海牛和鸵鸟就分布到不同的板块上去了，

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是不是就是因为几亿年前南美洲和非洲是一个陆地，由于漂移使得这个陆地分裂，陆地上的海牛和鸵鸟就分布到