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英国北爱尔兰ASSIGNMENT代写:脊椎动物

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格陵兰鲨鱼是一种主要以鱼类为食的顶级捕食者。但是,实际上从未观察到狩猎。清除报告很常见。鲨鱼用驯鹿,驼鹿,马,北极熊和海豹补充其饮食。虽然鲨鱼以海豹为食,但研究人员尚不清楚它是如何捕杀它们的。因为它生活在寒冷的水中,格陵兰鲨鱼的新陈代谢率极低。事实上,它的代谢率非常低,以至于物种的游泳速度与任何鱼类一样最低,所以它不能游得足够快以捕捉海豹。科学家们假设鲨鱼在睡觉时可能会抓住海豹。代谢率低也导致动物生长缓慢和长寿。因为鲨鱼有软骨骷髅而不是骨头,所以约会他们的年龄需要一种特殊的技术。在2016年的一项研究中,科学家对被捕获的鲨鱼眼睛的晶体中的晶体进行了放射性碳年代测定。该研究中最老的动物估计为392岁,正负120年。从这些数据来看,格陵兰鲨鱼的生存期至少有300到500年,使它们成为世界上寿命最长的脊椎动物。

英国北爱尔兰Assignment代写:脊椎动物

The Greenland shark is a top predator that feeds on fish. However, hunting has never been observed. Clearing reports is common. Sharks replenish their diet with reindeer, moose, horses, polar bears and seals. Although sharks feed on seals, researchers are still unclear how it kills them. Because it lives in cold water, the metabolic rate of Greenland sharks is extremely low. In fact, its metabolic rate is so low that the species swims at the same speed as any fish, so it can’t swim fast enough to capture seals. Scientists assume that sharks may catch seals while they sleep. Low metabolic rates also cause slow and longevity in animals. Because sharks have cartilage defects rather than bones, dating their age requires a special technique. In a 2016 study, scientists performed radiocarbon dating on crystals in the crystals of captured shark eyes. The oldest animal in the study is estimated to be 392 years old, plus or minus 120 years. From these data, Greenland sharks have a life span of at least 300 to 500 years, making them the longest-lived vertebrates in the world.