When the body is cold, an interaction of systems allows the body to warm itself. Which of these help the body warm itself when it is cold? Choose three correct answers.

Shivering (A) warms the body because rapid muscle contractions produce heat. When body hairs stand up (C), they can trap a layer of insulating air near the skin; goosebumps (D) occur as the hairs rise. Hair lying flat does not trap as much air, and sweating cools the body as sweat evaporates.

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