Ain\'t nature wonderful (Introduction)

by Balance_Maintained , U.S.A., Friday, September 17, 2010, 16:47 (5160 days ago) @ Balance_Maintained

For the Platypus:-The platypus, along with its fellow monotreme, the echidna, was believed to have evolved in isolation when the land mass that would become Australia (Gondwana) broke away from the other continents supposedly 225 million years ago.7 This idea of evolution in isolation followed the theory of Darwin, whose affinity for evolution may also have been influenced by his early studies of the platypus during his time on The Beagle.8-However, the discovery in the early 1990s of three platypus teeth in South America—almost identical to fossil platypus teeth found in Australia—threw that theory upside down.9 (Marsupials, too, were once considered to be exclusive to Australia, but their fossils have now been found on every continent.) Adult living platypuses do not have teeth, but the discovery of platypus fossils in Australia had already identified that their ancestors did have teeth, which were unique and distinctive.10 -For the Kangaroo, they are a genetic descendant from possum(theoretical, I have seen the theory published, but no DNA findings to substantiate). Marsupials are found all over the world, not only in Australia. (They have a possum festival in North West Florida every year.)