有哪些信誉好的足球投注网站- 1、本文档共68页，可阅读全部内容。
- 2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
- 3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
查看更多
The Biosphere and Animal Distribution - Welcome to Hartnell 生物圈和动物分布-欢迎Hartnell
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Continental Drift - The Case of Marsupial Evolution Marsupials appeared about 100 million years ago in South America. They spread through Antarctica and Australia that were at that time joined together. Continental Drift - The Case of Marsupial Evolution Marsupials encountered placental mammals in North America, could not compete, and became extinct. The modern opossums are recent arrivals from South America. The placental mammals expanded into South America, but the marsupials were well established there. About 50 million years ago, Australia drifted apart from Antarctica and remained in isolation with only marsupials to diversify on the continent. Wallace’s Line Wallace’s line represents a geographic separation between Asian and Australian faunas. A collision of tectonic plates brought formerly distant land masses closer together. Temporary Land Bridges Temporary land bridges have been important pathways for dispersal. Land bridge connected Asia and North America across the Bering Strait. Today, a land bridge connects North and South America Climatic Cycles and Vicariance Glacial cycles have occurred with durations of 20,000 to 100,000 years within the past three million years. Taxa sharing the same areas typically differ greatly in evolutionary age and in phylogenetic branching pattern. Climatic Cycles and Vicariance Cycling temperatures interact with the habitat requirements of animals. * * * * * * * * * * * * * * * * * * * * * * * * * * Aquatic Biomes Aquatic biomes account for the largest part of the biosphere in terms of area. Can contain fresh or salt water. Oceans cover about 75% of Earth’s surface. Have an enormous impact on the biosphere. Inland Waters Only about 2.5% of the earth’s water is fresh. Much of that is found in polar ice caps or underground aquifers. Inland Waters Lotic, or running water habitats include streams and rivers. More oxygen Lentic, or standing water habitats i
文档评论（0）