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Imagine the whole world as a single person. This person has inside many different living organisms or cells (like a normal human being). Then Imagine that these different cells do stuff to this PERSON (e.g. White blood cells defend this PERSON from other bad cells, etc..)
Basically Humans are like these cells; we are here for one purpose, and this planet is our home. We all have to do ONE thing and it's as natural as having babies!