How did these strange animals come to be?Why don`t they live on land?So far. these are the only animals scientists know of that could live in the deep undersea world.

• 这些奇怪的动物到底是什么呢.；为什么它门不生存在陆地上?到目前为止这些动物是迄今位置科学家所知道的唯一的可以生活在这么深的海底世界的动物!