The depletion of antioxidants caused by free radicals can damage all sorts of tissues, particularly your eye cells which are necessary for proper vision. (supernaturalacnetreatment.com)
Has studying these various kinds of extreme, deep - dwelling microbes changed your thinking about what's necessary for life? (discovermagazine.com)
The latter are helpful for only a few days each year, and may not be necessary for survival. (rsos.royalsocietypublishing.org)