Among polar bears, only pregnant females den up for the colder months. So how do the rest survive the extreme Arctic winters? New research points to one potential answer: genetic adaptations related to production of nitric oxide, a compound cells use to help convert nutrients into energy or heat.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/F...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/F...