Which feature is not found in viruses?

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.

Ibelieve z is the second because it looks like tissues, where has y is first because it's a cell, and the others look like organs or body parts.