Compare the emergence of advanced civilizations in Meso and South America with the four early river valley civilizations. Like the Phoenicians and the Egyptians, much of the Native American economy depended on what?

Carbon monoxide is usually more dangerous indoors.

Sector is best defined as (part).

Texas’ gulf coastal plains are the western extension of the coastal plain extending from the atlantic ocean to beyond the rio grande. its characteristic rolling to hilly surface covered with a heavy growth of pine and hardwoods extends into east texas. in the increasingly arid west, however, its forests become secondary in nature, consisting largely of post oaks and, farther west, prairies and brushlands.