Aneutral atom of helium has 2 protons and electrons. (enter a whole number.)

2 electrons since it is neutral and has 2 protons

Two. The number of protons equals the number of electrons

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.

Aplant cell has vacuoles and a cell wall