Which of the following is true about the heart? A. The heart has it's own blood supply
B. All apply
C. The heart is a single pump
D. It can function without nutrients or oxygen

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?