Because through natural selection, only the fittest survive. when the fittest come together and reproduce then the species continues and evolves with only the fittest and strongest genes.
They are mostly habittated to watter because they requres oxygen more from water or there organ setup to do it works properly under water.
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B. Fire let humans increase their energy use tenfold
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They each contain chlorophyll that absorbs violet-blue light and reflects green light.
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