Angiosperms, the flowering plants, are much more diverse than other groups of plants. One reason for this is the evolution of flowers, which increased plant interactions with pollinators and drastically increased speciation rates. This is an example of

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The evolution of flowers is considered a key innovation because it led to a significant increase in diversity and speciation rates in angiosperms. This innovation allowed for more efficient and specific interactions with pollinators, leading to the evolution of a wide variety of flowers and plants adapted to different pollinators. Thus, B is the correct choice as it describes the phenomenon discussed in the passage.

Angiosperms, the Flowering Plants, Are Much More Diverse Than Other