When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the majority sex. This is most clearly an example of _____.
a. sexual selection
b. frequency-dependent selection
c. stabilizing selection
d. balancing selection
e. disruptive selection
Answer: B