A coconut rolls down a beach, gets carried away from shore by the outgoing tide, washes ashore on a faraway


A coconut rolls down a beach, gets carried away from shore by the outgoing tide, washes ashore on a faraway island weeks later, and sprouts into a coconut palm tree. Years later, coconut palms are abundant along the shoreline, but rare up the slope of the volcano that occupies the middle of the island.
What kind of physical barrier may be preventing coconut palm seeds from dispersing to higher ground?


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