Which Statement Best Explains Why the Hawaiian Silverswords Underwent an Adaptive

question 153

Multiple Choice

Which statement best explains why the Hawaiian silverswords underwent an adaptive radiation and the mainland tarweeds did not?

• A) The ancestors of the silverswords had more ecological opportunities.
• B) There were fewer trees in the areas in which the ancestors of the tarweeds settled.
• C) Silverswords had a more behaviorally complex mating system, so there were more opportunities for the evolution of prezygotic reproductive isolation.
• D) Stabilizing selection prevented the evolution of reproductive isolation in tarweeds.
• E) Tarweeds exploited the "tree" way of life.

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