Concept:Biodiversity refers to the variety of life forms in a region. Tropical rainforests have the highest biodiversity due to warm, wet conditions year-round that support a huge number of species.
Explanation:Among the given biomes, the tropical evergreen rainforest biome has the largest biodiversity. It receives over 200 cm of rainfall annually and has a temperature range of 15–30°C. These stable, warm, and moist conditions allow the growth of many layers of trees and support a wide variety of plants and animals.
The temperate deciduous forest has moderate biodiversity with seasonal changes. The savanna biome has scattered trees and grasses, with dry seasons that limit diversity. The temperate grassland biome has grasses as dominant vegetation, extreme seasonal temperatures, and low rainfall, resulting in the least biodiversity.
Thus, the descending order of biodiversity is: tropical evergreen rainforest > temperate deciduous forest > savanna > temperate grassland.
Answer:B. Tropical evergreen rain forest biome