4. The center of the earth is called the...

a) crust.
b) mandle.
c) core.
d) lithosphere

the center of Earth is called the "core."

Explanation:

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.

answerformal;