Biologists classified populations of salamanders into different species based on morphology. later, another group of biologists found that the salamander species previously described interbreed within species but do not interbreed with different species, especially those that are sympatric. which statement best describes this scenario? reproductive isolation plays no role in the morphological species concept. reproductive isolation allows morphologically cryptic species to exist. the species were initially classified by the morphological species concept, and reproductive isolation has maintain discontinuities that evolve in different lineages. the species were initially classified by the biological species concept, and reproductive isolation has maintain discontinuities that evolve in different lineages. the species were initially classified by the morphological species concept; had these species been classified by the biological species concept, different results would have been obtained.