Hidden Species May Be Surprisingly Common Reports of cryptic species have increased dramatically over the past two decades with the advent of relatively inexpensive DNA sequencing technology. Mark Pfennninger and Klaus Schwenk, of the Goethe-Universitat in Frankfurts Germany, analyzed all known data on cryptic animal species aad discovered that they are found in equal proportions throughout all major branch, of the animal kingdom and occur in equal numbers in all biogeographical regions. m extremely surprised by their results. says Alex Smith of the University of Guelph`Intririo. Canada. Its a call to arms to keep doing the broad kind of genetic studies that we are doing. Examples of cryptic species include the African elephant. A 2001 study found the elephants were actually two genetically distinct.non-interbreeding species, the African bush elephant and the African elephant. The species are currently listed as vulnerable and threatened, respectively, by the World Conservation Union. In the early 1900s misidentification mosquito species based on morphology confused attempts to control malaria in Europe. Ultimately, what was thought to be a single species was actually made up of six sibling species, only three of which transmitted the disease. The basic unit in biology is always the species, and you hav to know what you are dealing with, Pfenninger said. Much previous research is now no longer used, he says, because it is not clear what species was studied. A The results of the research can help the development of many other research areas: C The results of the research can help our understanding of infectious disease evolution. 2. What was scientists understanding of cryptic species? B They were mostly found in insects and reptiles. D Both B and C A Not yet. C They will know the answer in another one or two years. 4. Which of the following about the African bush elephant and the African elephant is true? B They are interbreeding species. D They depend on each other for survival
可怕,里约奥运春竟起意外火灾
暴雨虐袭北京城,为何故宫偏不怕
干练波波头,最受女政客青睐的发型
无礼的问题:究竟是谁无礼?
赞比亚威武小象,冷静击退14只雌狮
你真的懂得如何道歉吗?
知乎精选文章:最令你印象深刻的文化冲击
美味零食杏仁,竟有减肥之效?
南苏丹正式排队征战奥运会
直面内心的敌人Facing the Enemies Within
你确定你的另一半就是你的灵魂伴侣吗?
美式英语占山为王,英国人都改写美式英语了?
连目的地都位置的冒险,你敢参加吗?
连皮也能吃的香蕉,还是你认识的香蕉吗?
如果时空可以任你行,你最想去到什么时候
长生不老的真假:他究竟有几岁
英文哲理短文:雪地遐想 Feeling in Snow
网络相亲靠不靠谱?过来人来告诉你
唏嘘,你知道多少钱才够你维持一段友谊吗
英语感人小故事:心灵创可贴
奇迹,美国男子7000米高空跳下竟毫发无损
健康须知:食用味精对健康有害吗?
喜不喜欢剧透,和你的聪明程度有关?
这五个坏习惯,万万要不得
刚刚成功减肥十磅的妈妈
阿根廷总统表示:吃猪肉有助提高性能力
你知道如何快速提高你的英语阅读速度吗?
你知道吗?这六种食物可能含有大量细菌!
为什么悲伤的歌反而会让我们的心情变好
电话英语培训究竟有无效果?效果如何?
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |