Final answer:
To prove that a male and a female fruit fly are the same species according to the biological species concept, you can perform a breeding experiment. If they can mate and produce viable, fertile offspring, then they are considered the same species.
Step-by-step explanation:
The biological species concept defines a species as a group of organisms that can interbreed and produce fertile offspring. To prove that a male and a female fruit fly are the same species according to this concept, you can perform a breeding experiment. If the male and female fruit flies can mate and produce viable, fertile offspring, then they are considered the same species.
For example, if a male fruit fly from one population is able to mate with a female fruit fly from another population and their offspring can also reproduce successfully, then it demonstrates that they are the same species.
It's important to note that fruit flies may have different physical traits or genetic variations, but as long as they can interbreed and produce fertile offspring, they are considered the same species according to the biological species concept.