Which three vegetation region have most value economically?

What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

Why did macarthur want to invade china? why did truman oppose this?

What is the amount of organic matter in all living organisms in a habitat called?