Humans differ from one another. Every person has special ability to do something. Every person can do some task better than others. But when humans are together they can do everything, they can do the best. That's why when humans work together they help one another and everything seems easy. I can show you an example. If in football team do not play together they never will win. They will win if they respect one another and if they play as group. That's why humans are strong when they do everything and work together. We exist because we are together.