3. However, some kinds of

　　1) Survival of fittest: some animals do have theirlethal shortages and would decline even without humans, saving those specieswhich are biological elimination is against the nature and of no help.

　　2) When we save a kind of animal, we may do harm to another kind.Thus the proper way is that human should try their best to keep the balance ofnature as it is rather than change the nature as humans purpose. Human andNature should perform their own functions respectively.

　　3) Instead of saving, the restrictions on human ourselves are moreimportant: pollution, environmental destroy, catching and killing excessively.

　　4) The extinction of species is the warning of the deterioration ofthe environment which would early or late threaten human beings.

　　Conclusion:

　　No matter from the position of practical utilization or morality,human both should ... However, it should be noticed that... Therefore, weshould find out the real reason of dying out. Furthermore, we should pay morea...to

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