Final answer:
The biological species concept does not apply to asexually reproducing organisms.
Step-by-step explanation:
The biological species concept applies only to sexually reproducing organisms. This is because it defines a species as a group of actual or potential interbreeding individuals that can produce viable, fertile offspring. Asexually reproducing organisms, which do not engage in sexual reproduction, cannot be classified using the biological species concept. Therefore, the problem with the biological species concept is that it does not apply to asexually reproducing organisms.