A crop produced for its commercial value (to make money).

The immunde system's way of protecting the body against infectious disease through antibodies.

Sending people to live and control an area and the people living there.

Relating to the structure of population including age, race, gender, occupation, and family status.

The part of the world that was known to Eurpoeans before the "discovery" of the Americas; the eastern hemisphere.

Foods that contain high levels of calories per serving.

Tiny organisms found in water, soil, air, animals and the human body.

The process of transferring plants, animals, mircrobes, and people across the Atlantic Ocean.

An economic system of trade in the 16th-18th centuries designed to increase exports.

A European term for the Americas before and during early exploration; the western hemisphere.

The number of people per unit of total land area of a country.