Having little fur, not very well! When humans get cold they get goose bumps - making the hair stand on end; for more hirsute species this traps warm air and helps to insulate the body. In humans, it has no benefit - it is a vestigial affect of evolution.
In place of hair, humans use technology - shelters and clothing to cope with cold.
Most mammals cope with cold weather with a layer of fat or their fur.
By thermoregulation.
Yes
sap gives it heat
by floating around the place
humans adapted to the cold by building a resiliance to it. another way this adaptation has occured is that those that live in the far northern parts of the glode has smaller noses, this is to reduce chance of the nose freezing off.
No, a guinea pig's cold is not transferable to humans.
they are covered I bark and they basically go in to hibernation
Some hibernate. Some have fur and / or blubber as insulation.
freezing cold that us humans can't survive there
it is too cold for swimming if that is what you mean
Sleep deprivation can impair the body's ability to regulate temperature and cope with cold environments. Lack of sleep can disrupt the body's internal clock, leading to decreased thermoregulation and reduced ability to generate heat, making it harder to stay warm in cold conditions.