The region known for having the highest biodiversity in the world is the Tropical Rainforest biome. Areas like the Amazons and Southeast Asian rainforests are teeming with a vast array of plant and animal species, many of which are endemic to these areas. Biodiversity in these forests supports complex ecosystems and contributes to environmental stability. Additionally, tropical rainforests play a crucial role in carbon dioxide absorption, making them essential for combating climate change and maintaining global ecological health.