Task: Paraphrasing
Input (English): Question: What happens when mammals raise their hair with tiny muscles in the skin? 
Answer: goosebumps. 
Sentence: Goosebumps happen(s) when mammals raise their hair with tiny muscles in the skin.
Output (English): Goosebumps, like the ones you get when you're cold, occur when tiny muscles in your skin lift up your hair.