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Continental Drift
[ Download from this server (12.70 Mb) ] 26.01.2014, 23:28
Wegener's theory of continental drift suggests a hypothesis about stage-by-stage division of continents in the past two hundred and fifty to fifty million years. Similar plant and animal fossils are found around different continent shores, suggesting that they were once joined. According to this hypothesis the unified primary centre of formation for most ancient ancestors of lupin probably existed in the Cretaceous and subsequent periods on Laurasia. Further on, as a result of subsequent division of the continents, the development of remote ancestors of lupin continued independently on the divided parts. It was homologous but not identical, pursuant to the Vavilov’s law of homological series.
Category: My files | Added by: bskurlovich
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