Final answer:
The area in Canada containing 33% of its biodiversity is the Carolinian forest. This region's rich variety of species is significant on a national scale, similar to global biodiversity hotspots that Conservation International focuses on.
Step-by-step explanation:
The area that contains 33% of Canada's biodiversity is the Carolinian forest. This region, located in the southernmost region of Ontario, boasts a significant portion of the nation's flora and fauna. In the context of global biodiversity, Conservation International emphasizes the importance of biodiversity hotspots, and while the Carolinian forest is not officially designated as one, it resembles these hotspots by containing a rich variety of species within a relatively small geographical area.
Due to its unique location and climate, the Carolinian forest provides habitat for a diversity of plant and animal species not found elsewhere in Canada. While biodiversity hotspots as identified by Conservation International, such as those covering only 2.3 percent of the Earth's surface, are critical areas for a substantial proportion of the world's terrestrial vertebrate species and plants, regions like the Carolinian forest in Canada plays a similar role on a national scale. Efforts to preserve such areas are vital for the conservation of biodiversity, understanding that each biome, including the boreal forest and others, holds significant value for global climate and biodiversity.