In the Section "Investigating Life: Birds Do It,Bees Do It",bumblebees

question 7

Multiple Choice

In the section "Investigating Life: Birds Do It,Bees Do It",bumblebees pollinated M.lewisii,whereas hummingbirds preferred the red-flowered M.cardinalis.If a hummingbird carries M.cardinalis pollen to M.lewisii,the resulting hybrid offspring are viable.M.lewisii and M.cardinalis are different species because of

• A)post-zygotic barriers to reproduction.
• B)pre-zygotic barriers to reproduction.
• C)punctuated equilibrium.
• D)gradualism.
• E)asexual reproduction.

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