The Amerindians of Canada or indigenous peoples of Canada were culturally, ethnically and linguistically diverse. Regarding the cultural division, there is a difference in the northeast region characterized by forests, the subarctic region and the Arctic region, as well as other smaller regions such as the Pacific coast and less extensive inland regions.
Linguistically there are three large families (Algonquian, Na-dené, Eskimo-Aleutian), and in the most abundant regions in resources there were higher population densities and also greater ethnic and linguistic diversity. Curiously, in some areas not covered by large families, isolated languages are spoken by people who do not seem to be phylogenetically their neighbors.
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Mesopotamians created irrigation systems to protect against damage from too much or too little water and to ensure a stable supply of water for crops and livestock.
The correct answer is - A. Desertification is increasing, and the desert is expanding.
The Sahara desert has been expanding in the past decades, and it has started to overtake territory south of it. This is mainly due to climate changes, the precipitation has been decreasing, the temperatures have been rising, so the desert has slowly crippled into the territories that were once steppes and savannas. There is an organized action from the people that leave on the borderline of the desert, where they have been thought some techniques as to how to stop the desert growing, and they have gladly accepted it and work hard on it. Initially it seems that there are positive results, but for sure only the time will tell.
