AP BIOLOGY

Detailed explanation-1: -Grassland biomes occur primarily in the interiors of continents (Figure 4) and are characterized by large seasonal temperature variations, with hot summers and cold winters (Figure 8).

Detailed explanation-2: -The tropical areas of the world contain the greatest biological diversity, and it is there where the greatest loss of plants, animals and micro-organisms is occurring.

Detailed explanation-3: -Tundra winters are long, dark, and cold, with mean temperatures below 0°C for six to 10 months of the year. The temperatures are so cold that there is a layer of permanently frozen ground below the surface, called permafrost. This permafrost is a defining characteristic of the tundra biome.

Detailed explanation-4: -The tundra biome is characterized by permafrost and its lack of trees. The soil is frozen year-around, which prevents large vegetation growth.