Why do animals such as a hedgehog
hibernate during the cold winter
months?

To reduce heat loss

Explanation:

During cold weather, small animals like hedgehog survive by hibernating. During hibernation, the hedgehog go into a deep sleep and the metabolic rate falls to the minimum required for maintaining the vital activities of the cells. The body temperature is maintained at a lower level typically at about 18 c. These reduces heat loss.

the three statements are true

Explanation:

Gradualism refers to a scientific theory that states that the emergence of new life forms, especially at the species level, is due to gradual steps, instead of abrupt steps (conversely to the idea of catastrophism). Darwin's theory states that evolution is a gradual process, suggesting that extreme phenotypic changes are removed by natural selection. Thus, gradualism indicates that selection and variation are processes that occurr slowly, while conspicuous phenotypic changes observed among higher taxa are due to the accumulation of many small morphological variations over evolutionary time.