Why did the native peoples of the Northwest build wood houses while those of the Southwest built with adobe?

The Native Americans in the Desert Southwest adapted to their environment by building houses of adobe instead of trees. They learned to farm in the desert and found crops that would grow in the desert environment. The Native Americans in the Pacific Northwest adapted to their environment by making things out of wood.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.