In the  initial encounter with the male intruder, resident male Cray fish showed extreme aggressive behaviors towards the intruder but after getting injected with octopamine, the resident male showed less aggression towards intruder males compared to their initial encounter. Based on what you know about serotonin an octopamine function, does the above situation of the injection octopamine makes sense? What might explain this and why do you say so?  Also, what fitness benefits might a crayfish that shows dominance behaviors and a crayfish that shows subordinate behaviors gain?

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Learning and memory

Learning is defined as a relatively permanent and irreversible adaptive change in behavior. It always results from experience. The ability of an organism to store and recall the effects, sensations, and knowledge gained through learning and experience is called memory.