Monday, 31 July 2017

DNA Analysis Reveals Why 'Water Bears' Are the World's Toughest Animals

By Jen Viegas, Seeker | July 29, 2017 08:10am ET

Tardigrades, also known as water bears, are less than a fraction of an inch in length, yet they are believed to be Earth's toughest, hardiest animals. They are virtually indestructible. Tardigrades have the ability to withstand complete dehydration. Once desiccated, they have been frozen in blocks of ice, exposed to radiation, and sent into the vacuum of space, and yet they still usually spring back to life when water becomes available again.

New genetic research, published in the journal PLOS Biology, reveals how tardigrades achieve such resurrections after drying to a crisp. The authors now even believe that alien life forms could possess this remarkable ability.

"If life exists on other planets, and it is water-based, then those organisms that live out of water will evolve to resist extreme events, including the threat of drying out," said co-author Mark Blaxter of the University of Edinburgh's Institute of Evolutionary Biology.


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