“Slash-and-burn” agriculture involves burning a portion of forest so that the soil there can be used for agricultural purposes. The community then uses this land for a short time, possibly a few years, and then moves on to a new area, which is, in turn, burned for agricultural use. This practice of agriculture is defined by a constant process of moving from one plot of land to another and is known as “shifting cultivation.”

Wetlands provide many services.  They filter water to make it cleaner, they absorb water from storms and decrease the probability of flooding in the surrounding area. They also tend to give a home to many different organisms. Destruction of wetlands impedes all of these services. Therefore, the correct answer must be  "increased resistance to storms and flooding." 

The primary advantage of “slash-and-burn” agriculture is that it allows for somewhat sustainable farming in relatively small tropical societies. The soil in many tropical climates is relatively weak in nutrients and so must be constantly recycled. Through a controlled system of “slash-and-burn” agriculture tropical soil is given enough time to recover and tropical vegetation is allowed the opportunity to regrow.

Goats, sheep, and camels all originated in southwest Asia and are one part of the reason why many of the earliest agricultural societies and human civilizations arose in this part of the world. Throughout the history of civilization goats and sheep have been important for sustaining and clothing human populations, and camels have been vital to facilitating trade and long-distance travel.

America is a very large and significant producer of wheat and corn. American wheat exports, for example, account for a quarter of the world’s supply of wheat. Wheat is a vital crop to maintaining the human population in its current numbers. Most of these important crops are grown in the “Great Plains” states such as Kansas, Nebraska, Iowa, Oklahoma, and parts of Texas.

Although now grown in tropical climates around the world, particularly in Central America, bananas originated in Southeast Asia. Bananas are one of the most widely consumed foods in the world and are a staple of diets in regions as diverse as the Andean mountains, the jungles of southeast Asia, and the urban areas of the developed world.

The “Pampas” is a region of South America encompassing most of Uruguay, the southernmost state of Brazil, and large swathes of Argentina. Its importance is derived from its great fertility. It is a lowland region that is highly suitable for large-scale agriculture.

Potatoes first originated in the Andean mountain region of South America (a region that includes the modern-day countries of Ecuador, Colombia, Peru, Chile, and Bolivia). They have long been a staple of the diet of people in this region, but in the 1500s they were brought back to Europe and became a staple of a diverse group of people’s diets around the world. Potatoes are uniquely malleable in terms of where and when they can be grown and have famously sustained whole nations in the past few hundred years.

Florida is the only state in America that can be said to have a tropical climate. The climate and terrain of South Florida is so unique in the United States that it is traditionally classed as its own separate category of agriculture. Florida is best suited to the growing of tropical crops, such as oranges. Texas has a varied climate, split largely between subtropical and arid desert regions. California ranges all the way from hot desert to subarctic to Mediterranean, but never gets to tropical. New Mexico has a semi-arid to arid climate. Alabama has a humid subtropical climate.

Corn first originated in Central America, in modern-day Mexico, roughly seven thousand years ago. From there it diffused northwards into modern-day United States, and then eventually around the world. Corn is a crop that is highly dependent on human intervention in order to survive and flourish.