An adult axolotl salamander Ambystoma mexicanum retains the

An adult axolotl salamander (Ambystoma mexicanum) retains the juvenile characteristics of external gills and a tail fin. allometry hybridization preadaptation paedomorphosis adaptive radiation Which best describes a population that forms a new species within the same geographical region as the original species? allopatric speciation sympatric speciation parapatric speciation autologous speciation heterogeneous speciation What kind of organisms likely perished due to the increase of oxygen in the atmosphere three billion years ago? Heterotrophs cyanobacteria obligate aerobes obligate anaerobes facultative anaerobes

Solution

4. D paedomorphosis

It means that the axolotl salamander in adult phase retains its external gills and tail fins which are juvenile characteristics. This allows salamander to be aquatic