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The population of our planet [increased|is increasing|increase|has increased] year by year, but the number of wild animals is decreasing. According to statistics run by the International Union for Conservation of Nature, one species or subspecies [dying|died|die out|dies out] each year. There is even a situation when partial extinction of some kinds of animals occurs in certain countries.

Why does this happen? Humanity directly affects the extinction of a large number of animal species. The main results of the human activity, which has a negative impact on the fauna, are: loss of the animal habitat; uncontrolled [hunting|hunter|hunted|hunts] in prohibited areas; extinction of animals to create products (like fur coats, purses, and bags); habitat pollution; and rapid expansion of human cities.

So, at the moment, it is very important [saving|to save|saved|saves] all biological diversity, because it was made by nature millions of years ago. The presented variety of animals is not just a random combination, but a unique coordinated working system. The extinction of any species [caused|causing|will cause|have caused] serious changes in the ecosystem. Each species is very important and unique for our world.