Paralith wrote:Well, I think that depends, really. Single celled organisms can and probably did, long before multicellularity and the evolution of animals, communicate between individuals via the secretion of specific molecules. (Communication being an attempt to influence another's behavior or physiology.) But do these count as pheromones since your listed definition clearly states animals? Even if we consider the earliest multi-cellular animals - they definitely had chemical communication between cells - they probably communicated chemically between individuals as well since they had no behavioral means to do so yet!
BioWizard wrote:What's your thesis/hypothesis/argument or perhaps opinion?
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