<span>The closer you are to the poles of the Earth, the fewer ecological niches for species to fill. </span>
Bacteria to amphibians. amphibians started to turn to fish and some started walking to land. They started laying eggs and turning into reptiles. those reptiles started growing hair turning them into four legged mammals. the mammals then turned to primates which evolved into us.
No system is closed off by it surroundings.
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