Time for Mammals

first_imgThree recent news stories about mammals involve time.  Does nature time things well, or do evolutionists tell swell things about time?  Time will tell.Placental mammals – Watch those assumptions:  How much can you trust dates that can vary by 50%?  A report in Science Daily says the new “consensus” date for the appearance of placental mammals just jumped from 122 million years ago to 84 million years ago.  The article mentions assumptions three times, though, with serious caveats about those dates: “However, this discrepancy may not be real, but rather appear because of the violation of implicit assumptions in the estimation procedures, such as abrupt acceleration of evolutionary rate entangled with gradual variation and large-scale convergent evolution in molecular level.”  Later, “They emphasize the necessity to scrutinize the implicit assumptions adopted by the models of molecular evolution and to develop procedures which rely little on those assumptions.”  A follow-up question: what are the new assumptions of the new study?Laotian Rock Rat — Yep, It’s a Living Fossil:  The unusual rat-like mammal found in a Laotian food market in 2005 (05/16/2005) is a living fossil, reported National Geographic News.  Some researchers claim that it “belongs to a family of rodents thought to have gone extinct 11 million years ago.”Bears – Keeping fit while sleeping:  On much shorter time scales (months), bears manage to keep most of their muscle strength during the winter hibernation.  Science Daily reported that “Bears in this study exhibited remarkable conservation of muscle function…. In spite of a size difference of almost three orders of magnitude and a 30 degree Celsius difference in torpor body temperature, the black bear may conserve muscle function to the extent of or perhaps better than small-mammal hibernators.” How the authors entered Colorado bear dens to take the measurements sounds like an adventure to be told somewhere.Anyone see evolution here?  Anyone see millions of years here?  Always scrutinize those implicit assumptions.(Visited 6 times, 1 visits today)FacebookTwitterPinterestSave分享0last_img

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