AP BIOLOGY

Detailed explanation-1: -Terrestrial ecosystems cover approximately 140 to 150 million km2, which is about 25 to 30 percent of the total earth surface area.

Detailed explanation-2: -Terrestrial ecosystems cover approximately 148 million km2, corresponding to 29% of the total surface area of the earth. They include such diverse habitats as the frigid regions around the poles, the searing heat of tropical deserts, and lush temperate and tropical rainforests.

Detailed explanation-3: -Boreal forests are found at even higher latitudes, and have the coldest and driest climate, where precipitation occurs primarily in the form of snow. Deserts are dry areas where rainfall is less than 50 centimeters (20 inches) per year. They cover around 20 percent of Earth’s surface.

Detailed explanation-4: -There are eight major terrestrial biomes: tropical rainforests, savannas, subtropical deserts, chaparral, temperate grasslands, temperate forests, boreal forests, and Arctic tundra.

Detailed explanation-5: -Taiga-Cold in the winter and warm in the summer, the taiga is the world’s largest land biome.