Geographic Isolation of SpeciesLook at the four squares [] that indicate where the following sentence could be added to the passage.说明前面应该会讲述一个完整的物种形成和殖民地化的过程。
托福 托福42 - Geographic Isolation of Species 错误反馈 阅读原文 中文译文 Biologist Ernst Mayr defined a species as “an actually or potentially interbreeding population that does not interbreed with other such populations when there is opportunity to do so.” A key event in the origin of many...
thereby preventing population interbreeding.With its gene pool isolated, a separate population can follow its own evolutionary course.In the formation of many species, the initial isolation of a population seems to have been a geographic barrier.This mode of evolving new species is called allopatric...
Geographic isolation creates opportunities for new species to develop, but it does not necessarily lead to new species because speciation occurs only when the gene poolundergoesenough changes to establish reproductive barriers between the isolated population and its parent population.The likelihood of allop...
所属专辑:硬啃之托福阅读 音频列表 1 TPO 41-3 trade and early state formation 326 2018-04 2 TPO 42-1 geographic isolation of species 317 2018-04 3 TPO 42-2 Explaining Dinosaur Extinction 291 2019-02 4 TPO 42-3 Callisto and Ganymede ...
TPO42-Passage1-Geographic Isolation of Species 2017-10-09 14:00:0100:11 154 所属专辑:边词边题单词书音频 喜欢下载分享 声音简介 此音频需要配合《托福边词边题》使用,现京东、当当网、亚马逊有售。边词边题将托福单词按照TPO阅读和听力顺序拆分成学习单元,用户可根据需要选择指定TPO的阅读或听力文章中的单词...
#托福阅读长难句# Geographic isolation creates opportunities for new species to develop, but it does not necessarily lead to new species because speciation occurs only when the gene pool undergoes ...
Geographic Isolation of SpeciesDirections: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ...
托福新托福 42 - Geographic Isolation of Species 阅读原文中文译文 Biologist Ernst Mayr defined a species as “an actually or potentially interbreeding population that does not interbreed with other such populations when there is opportunity to do so.” A key event in the origin of many species is...
thereby preventing population interbreeding.With its gene pool isolated, a separate population can follow its own evolutionary course.In the formation of many species, the initial isolation of a population seems to have been a geographic barrier.This mode of evolving new species is called allopatric...