Unlike the biological species concept, the morphospecies concept relies on: a. offspring. phenotype. physiology. behavior. a. offspring.b. phenotype.c. physiology.d. behavior. Solution B). Phenotype Biological species concept (BSC): According to the biological species concept, a biological species is the one in which, organisms can have interbreeding and produce the viable offspring. In contrast, the morphospecies concept relies on phenotype. The species are grouped according to the similarities in their morphological features..