Once the body has begun shivering, what happens to make it stop shivering?

When body temperature returns to normal, the nervous system sends a message to the muscular system to stop shivering.

Explanation:

i just took the test

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.