What happens with the skin in warmth or cold?
To the right you see the same bit of skin two times.
In one of those drawings the skin is in a warm environment, the other is in a cold environment. In the drawing you see a hair, a muscle (for erecting the hair), a sweat gland and some blood vessels.
Take a good look at the differences between both of the drawings. Write the differences down.
Which drawing do you think is from a cold environment? And which is from a warm environment?
Discuss your answer with a classmate. Do you agree with eachother? If not, ask a third classmate.