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,南大洋海底有一种单体动物——海
,科学家根据它的体积和缓慢的生长速度推测,它可能已经有一万五千年的历史了。