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Bumblebees Pollinate M

Question 25

Multiple Choice

Bumblebees pollinate M.lewisii,whereas hummingbirds prefer the red-flowered M.cardinalis.If,by chance,a hummingbird carries M.cardinalis pollen to M.lewisii,the resulting hybrid offspring are viable.M.lewisii and M.cardinalis are different species due to:


A) Post-zygotic barriers to reproduction
B) Pre-zygotic barriers to reproduction
C) Independent assortment
D) Gradualism
E) Adaptive radiation

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