Question

Why do placental mammals and Australian marsupials show similar appearances despite being phylogenetically distinct?

पर्याय

• They evolved independently under similar environmental pressures, demonstrating convergent evolution

• They are descended from the same common ancestor

• Environmental pressures have no effect on morphological evolution

• Marsupials migrated from placental mammal populations

Answer 1

Placental mammals and Australian marsupials show similar appearances despite being phylogenetically distinct because they represent convergent evolution. They evolved independently under similar environmental pressures, causing them to develop comparable ecological forms and body structures. This occurs when unrelated organisms occupy similar ecological niches and face similar selective pressures, leading to analogous adaptations rather than homologous structures derived from a common ancestor.