Convective zone is the answer. If you need an explanation just ask.
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The way that I know it is that cells make up tissue, tissue makes up organs, and organs make up organ systems.
Answer:The Upper Midwest, because of its numerous shallow lakes and marshes, rich soils, and warm summers, is described as being one of the most important wetland regions in the world. The area is home to more than 50 percent of North American migratory waterfowl, with many species dependent on the potholes for breeding
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