Volleyball-
You have two teams on each side of the net consisting of 6 players on each side in a formation of their choice Team A and Team B will either Pass Set Hit or block the ball coming back over they will play at least 2 matches or more either to 25 points or 15 points depening on the match number you will continue to play till the game follows a win
Its the Chromosomes, if your talking about the human cells.
They may experience irritability and depression because when a person constantly smokes, his/her brain begins to rely on the chemicals it gets from the person smoking, which results in the brain "getting lazy" and not producing the chemicals anymore. If the person were to suddenly quit, the brain would lack in the chemicals it had stopped producing, making the person feel constantly annoyed and depressed because of the chemical imbalance.