Shifting cultivation is best described as a. growing cash crops instead of crops for one’s own use b. abandoning land as soon as the soil begins to degrade c. changing crops from year to year based on demand d. choosing which crops to grow based on climate zone

C. changing crops from year to year based on demand

Explanation:

Crop rotation is a good agronomic practice consisting of planned alternation of species in a given area. Experts consider it an effective way to reduce the environmental impacts of monoculture by improving long-term physicochemical and biological soil conditions. In addition, it reduces the incidence - and gives more efficient management - of diseases, weeds and pests (favoring the breakdown of their life cycle).

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answer is  

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to prove that the triangles are congruent using the aas congruence