Savannah grasslands are home to many unique species, including trees which grow underground. Closely related to their more common above-ground brethren, these trees have evolved to develop their mass beneath the surface and only send small twigs with leaves up above ground. The how and why of this lifestyle has been the subject of some debate, but researchers now think they’ve cracked the puzzle: fire. The BBC reports: http://www.bbc.com/earth/story/20141103-why-some-trees-live-underground

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