Procreates

... in the world: 1-a historical growth rate of 1% 2-1/3 of the population dies every 82 years from disease, war, natural deaths, etc. 3-ALL humans procreates by sexual reproduction I did not personally perform the calculations. However, when this is applied to 2 modern day humans that "appeared" ...

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... booby has an offspring. This offspring has a mutation that causes it to have a curved beak. For some reason the curved beak booby survives and procreates, the offspring now have curved beaks, the curved beak boobies have trouble feeding as the other boobies do so they venture out to find plants ...

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