Which options best exhibits continuous variations

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.

Digestion because it removes waste

Not only is it the purchase of about 40% of america, it also grounds to on-go our advancement as a civilization.