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　　some believe use animals any way to fulfill human needs, others argue its wrong to exploit animal for human purposes. discuss both sides and give your own opinion.

　　living much longer than human beings, animals are the main creatures on earth, which have been used as a vital living material for mankind along with the civilization. at the same time, animals fulfill people's daily demands, and also suffer from the eco-changes.

　　obviously, animals and plants are the key elements of human needs including food resources and clothing materials. in other words, almost all the foods are made from either plants or animals, which provide people with tasty dishes as well as sufficient nutrition. without them, it is impossible for anyone to make a living for a long time. let alone animals may help people to do some heavy farming years ago. as a substitution of labor force, animals liberate people from heavy workloads so that human beings may contribute more to ideology and brain development.

　　however, the ill treatment on animals will make human beings eat their own bitterness. it is noticeable that the whole ecological system is a tremendous cycle maintaining a balance between human beings and other species. if a single kind of animal goes extinct, the food chain will be disturbed, which make damages on the whole system, as a part in that surrounding, human beings cannot escape from the dying out. the worse is that, under a mood of ill treating animals, people will cultivate a habit of indifference and isolation even to their own specie. the psychological changes will impose human beings negative influence, in both working and befriending.

　　in sum, as good companions of human beings, animals always help people in many aspects. frankly, there is no substitution of animals yet, so people should make good use of them wisely.

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