海洋一直处于变化之中,海洋中的生物也一直处于变化中。有些海洋生物的种类和数量变动是我们能够感受得到的,如近岸鱼类和大型藻类的数量变动;也有很多海洋生物的变动是我们感受不到的,如一些小型和微型生物、大洋中和深海中的生物。事实上,很多海洋生物在我们认识它们之前就已经消失了,同时一些新的物种产生了。当一种生物能被我 The ocean has always been in flux and the creatures in the ocean are constantly changing. Some species of marine life and changes in the quantity we can feel, such as the number of nearshore fish and large algae changes; there are many marine life changes we can not feel, such as some small and micro-organisms, ocean and Creatures in the deep sea. In fact, many marine life has disappeared before we know them, and at the same time some new species have emerged. When a creature can be me