These agranulocyte phagocytes reside in skin and mucous membranes and are considered Antigen Presenting Cells (APCs) that stimulate adaptive specific immunity.

The United States has mineral rights on Antarctica.

Hazards to the environment associated with coal mining may include

It is easier to estimate coal reserves than oil or gas because the coal is solid and does not migrate.

The United States imports some of the minerals of which we have ample supplies so that we can export ours to other countries for profit.

Which of the following energy sources is associated with plate boundaries?

Which of these is a nonrenewable resource?

The United States has no reserves of 

Currently the United States

Currently the United States