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Among thorns by oscarps

Cactaceae are thought to have evolved between 30 and 40 million years ago. The American continent was united to the others, but it was separated progressively by the continental drift. The endemic species of the New World had to develop after this separation; Significant distancing was achieved in the last 50 million years. This could explain the non-existence of endemic cacti in Africa: these evolved in America when the continents had already separated.

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Written by oscarps

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