Question

intrasexual selection leads to the evolution of
multiple choice
nesting activities between the two parents
alarm calls that differ depending on the predator
bright plumages in males to attract females
structures in males that are used in combat with other males

Explanation:

Intrasexual selection is a form of sexual selection where members of the same sex (usually males) compete with each other for access to mates. This competition often leads to the evolution of traits that enhance an individual's ability to win these contests. Structures used in combat (such as antlers in deer or large claws in some crustaceans) are direct results of such competition. Nesting activities are more related to parental care, alarm calls are anti - predator adaptations, and bright plumages for attracting females are examples of intersexual selection (where one sex chooses mates based on certain traits).

Answer:

structures in males that are used in combat with other males