Final answer:
The Terrestrial Biome covers 45% of Earth's surface and includes grasslands, forests, deserts, and tundra.
Step-by-step explanation:
The biome that covers 45% of Earth's surface is the Terrestrial Biome. Terrestrial biomes include grasslands, forests, deserts, and tundra. Grasslands are dominated by grasses, forests are dominated by trees, deserts occur where rainfall is less than 50 cm each year, and tundra is the coldest biome. The distribution of these biomes shows that the same biome can occur in geographically distinct areas with similar climates.