All organisms need to communicate with the biotic and abiotic components of their environments.
Organisms also communicate within themselves.
We saw during our discussions of homeostatic mechanisms and physiological adaptations that insects need to register conditions and changes within themselves and in their environments, and then respond to the conditions. The physiological basis of homeostatic mechanisms is that an organism can somehow measure aspects of the parameters that are regulated. For examples, changes in hemolymph salt concentrations and thoracic temperature need to be registered before corrective action can be initiated. Insects also respond to changes in their environments. Mechanisms of entering diapause seem a particularly good example.