Final answer:
Competition is an intraspecific limiting factor because it occurs when individuals within a population compete for the same resources. As the population size increases, this competition intensifies, which affects the population growth rate.
Step-by-step explanation:
Competition is an intraspecific limiting factor because the more individuals of the same species living in an area, the sooner they use up available resources. Intraspecific competition occurs when individuals within a population compete for the same resources such as food, water, shelter, and mates. As population size increases, this competition intensifies and can have a dramatic impact on the population growth rate.