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Writing sysytem of any language is known as script. It is needed to express any language that can be read easily. It is also needed to keep the records of  outlines of  every aural, visual, behavioral, and lingual element. 

Ans. A complex machine is a combination of two or more simple machines that work together, such as when a lever and a wheel and axle are combined to form a cart.

a stimulus (plural stimuli) is a detectable change in the internal or external <a href="https://en.wikipedia.org/wiki/Environment_(systems)" title="Environment (systems)">environment</a>.

Ans. The prairies are flat and very fertile, with rich black soil. Flat land is good for farming. The fertile prairie areas are intensity cultivated. Farmers produce enough wheat for the country and also for exporting. This is why prairies is called the wheat basket of the world.

The climate of prairie is the most suitable for the cultivation of wheat. Therefore the wheat production is very large here. Therefore, only USA exports the wheat mostly. Therefore, the prairie is known as Wheat Basket of the world.

                                                          United We Stand Divided We Fall

Unity is strength. A united group of people can always achieve more things than a single man. That is the reason groups are formed in many fields. In ancient times, man used to live alone. He traveled alone and hunted single handedly. But soon he realized that if he joins hands with his fellow men, he can face many of the common dangers. Thus villages were formed which in turn developed into towns, cities and countries. In modern times also groups are formed in all fields and walks of life. We have realized that by forming unions, we can demand and achieve things in a stronger way than by standing alone. There is the story of a rich old man who had tensions. But they always quarreled with one another. The old man knew that if he died, his wealth would be squandered by the quarrelling sons. So he called them to his side and showed a bundle of ten sticks. He asked each one of them to break it into two. But however they tried, none could break the bundle. Then he untied the bundle and gave them each a stick asking them to break it, which they did easily. Thus the sons realized their foolishness and began to live in harmony.