What Is Life? 2nd Edition by Jay Phelan

Exercise 6

In Belding's ground squirrels, why are females much more likely than males to engage in altruistic behavior by sounding alarm calls?
A) Belding's ground squirrels have a sex ratio that is biased toward females.
B) Females invest more in foraging and food storage, so they are more likely to lose their lives or their food if a predator attacks.
C) Belding's ground squirrels have a sex ratio that is biased toward males.
D) Females tend to remain in the area where they were born, so the females that call are warning their own kin.
E) Males forage alone, so their alarm calls are useless.