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Sweet potatoes are fairly inexpensive but very helpful for our health. It contains more vitamins (A, B, C, E), protein, starch, amino acids as well as over ten types of vital elements (calcium, magnesium, iron, zinc). In addition, the foodstuff comes with a abundant level of fiber that can stimulate stomach contractions. Another important thing is oligosaccharides in sweet potatoes maintain the elasticity, reduce blood levels of cholesterol and ease circulation in the blood vessels. When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. Wildlife Conservation is the protection of varieties of life inhabiting the protected areas like national parks,wildlife sanctuaries.Its significance is in the fact that all living creatures include the thing about this complex but fragile web of life along with a slight disturbance can begin to play havoc using this web of life.The flora and fauna of this planet has been destroyed at an alarming pace and if sincere efforts are not provided with the proper time,an enormous socio-economic cost can be paid by us,humans.A variety of work is going on in the international levels to save & preserve the wildlife.A large number of living beings are stored on the verge of extinction like tigers,elephants,rhinoceros,snow leopards,giant pandas,bears,birds like siberian cranes,western tragopan,vultures.The disappearance of such mammals like tigers,lions,bears has emboldened the vested elements to destroy the forests his or her fearsome inhabitants disappear during these places.Worldwide work is created to create more areas as protected areas to ensure that a growing number of habitats could be given to these wildlife creatures.But the ever soaring adult population has posed most serious threat.More areas are transformed into concrete foests to accommodate the human being needs and greeds.