A) Pheromones
B) Prostaglandins
C) Corticotrophin
D) Catecholamines
Correct Answer: A
Solution :
A pheromone is the chemical messenger that triggers a social response in members of the same species. These are chemicals capable of acting outside the body of the secreting individual to impact the behaviour of the receiving individual. There are alarm pheromones, food trail pheromones, sex pheromones and many other that affect behaviour or physiology.
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