Sir Issac Newton was the one who purposed the gravity theory.
The answer is selective breeding
The answer is 78% nitrogen gas
C, if you look at a water wheel, water flows on the wheel, turning a rod, powering something on the inside. Dams do the same thing except the rod goes into a transformer and is more complicated.
2.)for they can grow green leaves through Photosynthesis in which plants convert energy from the sun.