How do humans cause eutrophication?

The second one, doing to much of an activity can cause excess amounts of nitrogen and phosphorus into water

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.

Single strand binding protein by peptide bond