Variation in which characteristic would best help bison surviv a harsh winter?

During the cold winter season, bison develop thick, woolly coats that help protect them from freezing temperatures and harsh winds. It is said that a bison's winter coat is so thick and provides insulation so effective that when snow accumulates on its coat, it will not melt from the heat of the bison's skin.

Ireally don’t know

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;