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What has most likely caused the decrease in wing length in barn swallows?

A. Decreased wing length is a trait that female barn swallows find more attractive in males.
B. Decreased wing length has allowed barn swallows to take flight and fly faster to evade cats.
C. Decreased wing length has allowed barn swallows to build smaller nests on roadsides built by humans.
D. Decreased wing length is a trait that feral and outdoor cats find unappetizing in barn swallows.



Answer :

GinnyAnswer

Final answer:

Decreased wing length in barn swallows is likely a result of sexual selection, where traits for mating success can evolve independently of survival benefits.


Explanation:

Decreased wing length in barn swallows is most likely a result of sexual selection, where traits not necessarily linked to survival become preferred for mating success. This phenomenon, known as sexual selection, can lead to the development of characteristics that are not advantageous for survival but enhance reproductive success, such as smaller wings in male barn swallows.


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