Final answer:
The rate of aggressive interactions among individuals increases as population density increases. This is an example of a density-dependent factor.
Step-by-step explanation:
The correct answer is a. true.
As the population density increases, the rate of aggressive interactions among individuals also increases. This is an example of a density-dependent factor because it becomes worse as the population density increases.
Research has shown that when individuals are in close proximity to each other, competition for resources such as food, nesting space, and mates increases, leading to an increase in aggressive behavior. This phenomenon can be observed in various animal species, including mammals, birds, and insects.