高中英語作文：睡眠的進化(Evolution of Sleep)_英語作文范文
在平日的學習、工作和生活里，大家總免不了要接觸或使用作文吧，寫作文可以鍛煉我們的獨處習慣，讓自己的心靜下來，思考自己未來的.方向。相信許多人會覺得作文很難寫吧，以下是小編整理的高中英語作文：睡眠的進化(Evolution of Sleep)_英語作文范文，歡迎閱讀，希望大家能夠喜歡。
there is some evidence that the two types of sleep, dreaming and dreamless, depend on the life-style of the animal, and that predators are statistically much more likely to dream than prey, which are in turn much more likely to eperience dreamless sleep. in dream sleep, the animal is powerfully immobilized and remarkably unresponsive to eternal stimuli.
dreamless sleep is much shallower, and we have all witnessed cats or dogs cocking their ears to a sound when apparently fast asleep. the fact that deep dream sleep is rare among prey today seems clearly to be a product of natural selection, and it makes sense that today, when sleep is highly evolved, the stupid animals are less frequently immobilized by deep sleep than the smart ones. but why should they sleep deeply at all? why should a state of such deep immobilization ever have evolved? perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in general seem to sleep very little. there is, by and large, no place to hide in the ocean. could it be that, rather than increasing an animals vulnerability, the function of sleep is to decrease it? wilse webb of the university of florida and ray meddis of london university have suggested this to be the case. it is conceivable that animals who are too stupid to be quiet on their own initiative are, during periods of high risk, immobilized by the implacable arm of sleep. the point seems particularly clear for the young of predatory animals. this is an interesting notion and probably at least partly true.
【高中英語作文：睡眠的進化(Evolution of Sleep)_英語作】相關文章：
Sleep and Get Up Early 小學英語作文08-31
sleep的ing形式08-24
高中英語作文話題-高中英語作文02-18
高中英語作文及翻譯-高中英語作文12-30
dream 高中英語作文_高中英語作文12-13
hero高中英語作文_高中英語作文12-13
friend高中英語作文_高中英語作文12-15
精選英語作文：睡眠不足的壞處06-29
睡眠不足的壞處英語作文05-20