Nothing has to be good for anything. Any living thing is alive through a series of evolutionary steps that basically kept it ahead of the game. As long as something is well suited for its environment it will thrive, it doesn't need a "job". In fact, its job, and the job of all living things, is to reproduce. Thats all there is to life, to make more little useless things to amuze whatever higher power is watching us for entertainment...
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