Why does overproduction of organisms cause competition of resources?

Among these were overproduction, competition, and variations. Overproduction happens when species reproduce many more offspring than can possibly survive. ... Many species create many more offspring than there are resources like food, water, and living space to support them.

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overproduction would cause the species to fight for the same foodit would become scarce in the environment causing survival of the fittest

sex cells are usually half's then they find another half and make a fertilize egg