True or false: the United States has a command economy, and the government controls all aspects of the production of goods?

Based on current rates the earths human population is expected to grow how much by 2050

Why do so many children develop illnesses in southern africa? a. poor nutrition due to poverty c. very bad air pollution b. climate many diseases thrive d. declining life expectancy

Plants in the arctic tundra must be able to live a) in wide range of temperatures b) without sunlight for the most of winterc) without waterd) at high elevations