Complex sentence: In contrast with the idea of a physiological or reflex response, an operant is a class of structuresponses, where the individuals differ but the class coheres in its function-shared consequences with operants and reproductive success with species.
Split into simpler sentences: In contrast with the idea of a physiological or reflex response, an operant is a class of structurally distinct but functionally equivalent responses. Operants are often thought of as species of responses, where the individuals differ but the class coheres in its function-shared consequences with operants and reproductive success with species.