Earth isn’t really that big, if you think about it. Biodiversity on Earth is really a wide span.
In: Biology
They aren’t, it is just that humans are good at spotting the rather minor differences in the species rather like how penguins can tell each other apart. The one major easy difference is skin colour which is due to solar radiation being greater near the equator so darker skins are more useful to prevent sunburn and skin cancer and towards the poles lighter skin is useful to convert sunlight into vitamin D.
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