A group of conservation biologists wish to develop a plan to preserve an endangered species of salamander,
but it is difficult to determine exactly which salamanders belong to that species. A nearby species looks very
similar, and it is impossible to do DNA tests in the field. Thus, it is difficult to develop a useful conservation plan.
To avoid most of these difficulties, the scientists should probably define the species using which approach?
Evolutionary species
Morphological species
Functional diversity
Biological species
