In the section "Investigating Life: Birds Do, 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.
Answer: B. pre-zygotic barriers to reproduction.
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