Use the Following Information When Answering the Corresponding Question(s)

question 30

Multiple Choice

Use the following information when answering the corresponding question(s) .
In 1983 a population of dark-eyed junco birds became established on the campus of the University of California,San Diego (UCSD) ,which is located many miles from the junco's normal habitat in the mixed-coniferous temperate forests in the mountains.Juncos have white outer tail feathers that the males display during aggressive interactions and during courtship displays.Males with more white in their tail are more likely to win aggressive interactions,and females prefer to mate with males with more white in their tails.Females have less white in their tails than do males,and display it less often.(Pamela J.Yeh.2004.Rapid evolution of a sexually selected trait following population establishment in a novel habitat.Evolution 58[1]:166-74. )
-Refer to the paragraph on dark-eyed junco birds.Which of the following could explain why males display more often?

• A)Many male juncos die without fathering any offspring.
• B)Females have to expend energy competing for mates.
• C)Males are more aggressive than females.
• D)energy cost asymmetry in male and female parental investment