Select the names of each layer of the Earth

The Crust: First and thinnest layer

Mantle: Lithosphere, Asthenosphere - Second layer

Outer Core: Third layer, surrounds the Inner Core

Inner Core: Fourth layer

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.

a and b because with the other three, they simplify to something else.