送交者: 随便 于 2005-4-03, 00:18:47:
回答: 不对。 鲨鱼没有SWIM BLADDER所以不游就沉 由 HunHunSheng 于 2005-4-03, 00:07:45:
Some shark have to swim all the time in order to breathe, but some can lie motionless on the bottom and breathe by pumping water over their gills. Nurse sharks, bull sharks and lemon sharks can all do this.