The correct answer is option 4 - the Tropic zone. Biodiversity refers to the variety of living organisms, including plants, animals, and microorganisms, that exist in a particular area. The Tropic zone, also known as the tropical zone or the tropics, is the region near the equator between the Tropic of Cancer and the Tropic of Capricorn. This region is characterized by warm temperatures and high levels of rainfall, creating a favorable environment for a wide range of species to thrive.

The Tropic zone is home to numerous ecosystems, such as tropical rainforests, coral reefs, and mangrove forests, which support an incredibly diverse array of plants and animals. These ecosystems provide a wide range of habitats, from dense forests to marine environments, which allows for the coexistence of a vast number of different species.

On the other hand, the other options - Tundra zone, Prairie zone, and Torrid zone - do not have the same level of biodiversity as the Tropic zone. The Tundra zone, found in high latitudes near the polar regions, has a harsh climate with low temperatures and limited vegetation. The Prairie zone, also known as the grassland region, is characterized by a drier climate and a lower diversity of plant