Question

Lake Victoria is home to a group of related fishes known as cichlids. Hundreds of forms are present, differing slightly in their color patterns, habitat use, and feeding behavior. What is the best method for scientists to determine conclusively whether the fish are members of a population that has a lot of variation or whether they are members of entirely different species?

Answer 1

The biological concept of species states that if 2 organisms can interbreed and produce fertile offspring they belong to the same species.

Scientist could observe them under natural conditions and check if they can reproduce to produce fertile offspring.