You are presented with the question "Why do some animals have hair that grows longer during the winter?" and the following answer choices: - It expands - to make braids - to wear a scarf - to attract mates - When it's cold - to stay warm - It remains dormant - genetic diversity Now knowing that some animals' fur grows thicker for staying warm in the winter and mammals have hair and fur, choose the best answer.
The answer to this question is:
to stay warm