Heck, there is an individual animal, a sponge, on the Southern Ocean's seafloor that scientists guess could be as many as fifteen thousand years old, based on how big it is and how slowly it grows.
实际上,南大洋海底有
种单体动物——海绵,科学家根据它的体积和缓慢的
长速度推测,它可能已经有
万五千年的历史了。