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http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=112803&org=NSF...Deep in the cold tundra of northern Canada, where it is dark much of the year, Siver recently had the opportunity to sample mud dating back 48 million years. The material lay deep in the bowels of a diamond mine under 150 feet of glacial material that covered the remains of an ancient lake. Viewing the mud sample under an electron microscope, Siver discovered a microorganism identical to those that exist today in the tropics. These tiny organisms had instantly proven that the area was once warm and tropical.
But I can’t see how any particular traits or anatomical construction of a species or an order might render it less or better equipped to survive.
My ammonites die off every year, but they seem to recover in the spring, unlike my nasturtiums.