鲨鱼是自诞生以来几乎没有进化的极个别物种之一,它已经存在几千万年了。几千万年来,物是人非,沧桑巨变,鲨鱼却始终保持着它“创世”之初的形象。其惟一的原因就是:鲨鱼没有天敌,没有竞争对手,它是大海中食物链金字塔的顶。因此,它用不着费心为适应环境而小心翼翼地进化自己的 Sharks, one of the very few species that have hardly evolved since their birth, have existed for tens of millions of years. For tens of millions of years, things have changed from person to person, and the vicissitudes of life have changed dramatically. Sharks have always maintained their image of “creation” at the beginning. The only reason is that sharks have no natural enemies and no competitors, it is the top of the pyramid of food chain in the sea. Therefore, it does not bother to evolve its own in order to adapt to the environment