Question

which of the following pheromones helps regulate population density?○ epideictic pheromones○ aggregation pheromones○ territorial pheromones○ sex pheromones

Explanation:

Epideictic pheromones are specifically used by organisms to signal crowded conditions, which in turn helps regulate population density by discouraging further aggregation in an area. Aggregation pheromones attract individuals to a group, territorial pheromones mark and defend spaces, and sex pheromones facilitate mating, none of which directly regulate population density in the targeted way epideictic pheromones do.

Answer:

A. Epideictic pheromones