Answer: Herding animals.
In the zones of the semi-arid climate, there are huge areas of savannahs and steppes. Annual rainfall varies from 250 to 760 mm. This moisture is enough for grassy vegetation, but not enough for full forests. Severe droughts in these areas are a fairly common phenomenon. In open level spaces with rare trees prevail strong winds. The necessary conditions of existence of grassy vegetation of this zone are grazing of large herd animals which liberate vegetative communities from the accumulated straw and destroy bushes. The bulk of the plant grass mass is concentrated underground. The powerful root system allows it to accumulate nutrients and moisture. Herding animals stimulate the regeneration of vegetation.
When Sputnik went into orbit in 1957, America went into a panic. Only President Dwight Eisenhower retained his composure and understood that the United States was far superior to the Soviet Union in scientific research as well as in military firepower.
Egypt celebrates Christmas. Not many countries in North Africa do.
The piece of paper is an economic resource that can be used for a better cause. A used paper should be used to build a paper airplane.
<h3 /><h3>What is Economics?</h3>
Economics is the study of the production and consumption of goods in a country. It is also the study of the transfer and distribution of wealth.
Billy have built a paper airplane for fun, this is an acceptable action but the paper used in this regard could have been used for a better cause, the paper could have helped Billy to learn something or maybe he could have practiced writing, or he could have tested his knowledge by answering some questions on the paper or maybe Billy could have practiced drawing and arts for his art class.
There are many ways in which the paper could have been used for a better cause but Billy chose to use it by building a paper airplane which is quite unreasonable and a used paper that is of no use anymore can be used to build a paper airplane.
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Explanation:
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