Cold is also a big problem for most living things: slowed metabolism, frozen internal water, etc. Of course, not all organisms have to have high metabolic rates, and some organisms can keep from freezing by keeping their salt content high.
Of course, not all organisms have to have high metabolic rates, and some organisms can keep from freezing by keeping their salt content high.
http://earthobservatory.nasa.gov/Library/UVB/uvb_radiation2.html -- an interesting web page about the effects of radiation on life
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