Question

Scientific term for
Organisms which possess special features to protect themselves against the extreme cold or heat

Answer 1

hibernation ......can be the answer

as well as some animals even migrate during winters or sometimes even in summers ...

hope it helps ^^

Answer 2

Scientific term for  Organisms:

The scientific term for the special feature that animals use to save themselves from extremes of heat or cold is called adaptation.  By adapting themselves in extremes of climatic conditions, these animals survive even in Sahara desert or Antarctica.

Animals living in cold have thick layer of subcutaneous fat, thick fur, very narrow and thick veins, and food storing ability. Whereas that living in cold have wide and thin veins, water storing capability etc. These features lead them to survive in extremes.