Asteroid impact to an unprecedented flourishing of frogs in South America.

<P Align=center> </ P> World Scientific reports [tech.] News: The latest research shows that the extinction of the dinosaurs with an asteroid impact, could lead a South American frog breeding frogs out of the 162 Caribbean .class. .<P> These frogs belong to a strange type of frog without a tadpole stage, but directly from the frog eggs hatch out, there are about 800 kinds of this type of tree frog, accounting for almost one-fifth of the total number of frogs ., frogs are the largest species of vertebrates. .</ P> <P> "However, in the field of taxonomy, more is not necessarily representative of the good." .Biologist from the University of Pennsylvania Brian Erhai Kyrgyzstan's explanation. .</ P> <P> they occupy so many frogs species, mainly in the messy taxonomy, Dr. Hai Jisi explained, "a mess of things like trash, and each of these frogs .not particularly outstanding features ", in other words, a lot of frogs just about the same as or very similar properties to be reunited with our Motherland belongs to a species difference in the absence of relevant information, and is difficult to belong to the same genus. .Among the biological taxonomy, species of the genus on the next level. .</ P> <P> Haiji Si and his aides through genetic analysis to re-organize the "trash", making it a tree frog family tree map. .</ P> <P> their study not only found the frogs in the Caribbean branch of the family tree, but also described the incident with the asteroid hit the Earth between the links. .June 12 "U.S. National Academy of Sciences," published their research report. .</ P> <P> University of California at Berkeley biologist David Wake said: "The research assistant Dr. Hai Jisi solved a problem long plagued the scientific community", their findings indicate that the .South American invasion of a single species in the Caribbean up to 5000 million years bred a lot of coverage of the Caribbean, the islands of the descendants of different types of frogs. .</ P>.