Suppose you throw a cube-shaped object and a spherical-shaped object of equal volume in the same volume of water. the ball sinks and the cube floats. which explains why this might be?

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger