Silverswords Had No Tree and Shrub Competitors Prior to Recent

Silverswords had no tree and shrub competitors prior to recent human ecological disturbance to the Hawaiian Islands.Descended from a tarweed ancestor that evolved in an environment with many tree and shrub species, its arrival on the islands represented a(n) _______because of a(n) _______.

A) evolutionary radiation; variety of open ecological niches
B) lek; open ecological niche
C) evolutionary radiation; competitive ecological niche
D) lek; evolutionary radiation
E) evolutionary radiation; prezygotic reproductive barrier

Correct Answer:

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