Fact 1: Some animals' fur grows thicker for staying warm in the winter. Fact 2: Mammals have hair and fur. Given the two facts above, answer the question "Why do some animals have hair that grows longer during the winter?" with the following options: - It expands - to make braids - to wear a scarf - to attract mates - When it's cold - to stay warm - It remains dormant - genetic diversity
The answer to this question is:
to stay warm