But the problem states "12 species are present in only one zone (not both)", which is already consistent with separate counts.

Sun, 03 May 2026 16:30:28 +0000

Discovering Biodiversity: Understanding Species Distribution in Isolated Ecological Zones In the intricate tapestry of Earth’s ecosystems, biodiversity reveals fascinating patterns of species distribution. A notable observation in ecological studies focuses on species that exist in only one distinct zone—not shared between two or more regions. A key finding states: “12 species are present in only one zone (not both),” highlighting the uniqueness of localized biodiversity and the challenges faced by certain species confined to a single habitat. ### Why Are 12 Species Restricted to One Zone? Species limited to one ecological zone typically owe their presence to a combination of geographic isolation, specialized adaptations, and evolutionary processes. These species evolve in response to unique environmental pressures, climate conditions, and food sources exclusive to that specific region, making migration to other zones unlikely or impossible.