Final answer:
Intrasexual selection, or male-male competition, is a type of sexual selection in which individuals of the same sex compete for mates. This competition involves mating displays and aggressive mating rituals, with the winner being the individual who is able to mate.
Step-by-step explanation:
Intrasexual selection, also known as male-male competition, is a type of sexual selection where individuals of the same sex compete for mates. This competition often involves mating displays and aggressive mating rituals, such as rams butting heads or male birds engaging in territorial battles. The winner of these competitions is typically the healthiest, strongest, or most dominant individual, who then gets to mate and pass on their genes.