1) morphological: heat-insulating integument, subcutaneous layer of fat, change in body surface;
2) physiological: increased evaporation of sweat and moisture during breathing; narrowing or expansion of blood vessels, a change in the level of metabolism;
3) behavioral: construction of nests, holes, changes in daily and seasonal activity depending on the temperature of the environment.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.