但是这个海绵正在移动，实际上它是马尔代夫的一种海绵蜗牛——一种靠模仿海绵生存下来的软体动物。
But this sponge was moving, and it was in fact a Maldivian sponge-snail - a mollusc that survives by mimicking a sponge.
按照传统的见解，包括海绵、水母和珊瑚在内的简单动物按部就班发生演变，以线性方式形成像哺乳动物一样的更加复杂的生物体。
According to conventional thinking, simple animals, including sponges, jellyfish and corals, evolved step-by-step in a linear fashion into those with more complex bodies, such as mammals.
同样地海狸建造堤坝，赤点石斑鱼挖掘和维护明显的坑洞，这些坑洞的石质表面成为珊瑚虫，海绵动物和其他海洋生物聚集的地点。
In the same way beavers construct DAMS, red grouper excavate and maintain distinct holes whose rocky surfaces provide a place for coral, sponges and other Marine life to congregate.
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