A two-inch-long, worm-like sea creature is the earliest-known animal to have the beginnings of a backbone.
发现人类亲缘最古老的祖先——一种2英寸长类似蠕虫,聚集在海床上的生物。剑桥大学的科学家证实,一种2英长类似蠕虫的海洋生物是目前已知的最早的脊椎动物。
Cambridge University scientists have confirmed. This makes Pikaiagracilens, which evolved more than 500 million years ago, a precursor of modern vertebrates, including humans. The latest study resolves a debate about whether it is the first member of the chordate family. Humanbeings, as well as fish, amphibians, birds, reptiles and mammals are all descended from this two-inch creature —Pikaiagracilens which lived in the sea 505 million years ago.
这使得5亿多年前就进化完成的一种生物——Pikaiagracilens(皮卡虫),成为了现代脊椎动物的祖先,甚至还包括人类。这项最新的研究终结了一场关于它是否是脊椎动物家族中第一个成员的争论。人类,还有鱼、两栖动物、鸟、爬行动物和哺乳动物等等,都起源于这种2英寸的生物——Pikaiagracilens,一种5.05亿年前生活在海洋的生物。
体坛英语资讯:Flamengo win maiden Brazilian Supercup
什么是机会成本?
国际英语资讯:WHO secures 2 mln USD to contain COVID-19 pandemic in Africa
国际英语资讯:Confirmed COVID-19 cases worldwide exceed 1 million -- Johns Hopkins University
英女王私人庄园不够住 王室成员佣人房里过圣诞
英专家称退休金制度已不适合21世纪
国际英语资讯:UN climate talks in Glasgow postponed until 2021 due to COVID-19
国际英语资讯:Brazils COVID-19 death toll reaches 240, with 6,836 infected
体坛英语资讯:Dortmunds new guardian of stability
国内英语资讯:14-day quarantine required for out-of-town patients in Beijing
玛莎百货将使用中性玩具包装
疫情期间该如何打扫房间?
我想一整天都和男朋友在一起
体坛英语资讯:Beijing 2022 organizing committee holds high-level video conference with IOC
投资者要关注税收和通货膨胀
新西兰封城违规举报网站因举报太踊跃而瘫痪
纳尔逊·曼德拉:你不知道的六件事
国际英语资讯:Erdogan, Putin discuss ways of cooperation against COVID-19
国内英语资讯:Vice premier stresses reserve of emergency medical supplies
体坛英语资讯:Analysis: Dortmunds unpleasant reunion with Tuchel
国内英语资讯:China to strengthen epidemic control along land border
国际英语资讯:UNICEF commends China for its support to maternal, neonatal health services in Africa
法国成功为病患移植人工心脏
英国广播公司拒绝禁播反撒切尔夫人的歌曲
旅游业收入骤降 泰国大象可能要挨饿了
斯诺登在莫斯科做宅男 自称已经取得胜利
什么是"无症状感染者"?
【新年策划】新年新科技
国内英语资讯:China refutes U.S. officials accusations of concealing extent of virus
国际英语资讯:Trump says not to issue national stay-at-home order
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |