By definition, a sympatric speciation is a biological process wherein the evolution of a certain species most likely comes from their single ancestral species. Its main difference from the allopatric speciation is that the evolution does not necessary require to be physical in nature, therefore, it is most likely to occur less frequent.
They need water,light, and carbon dioxide
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They have been in the Northern and Southern polar regions, and not within the inner part of earth, maybe due to there location