As almost everyone knows, 1.(become) extinct is to be gone forever. Natural extinction happens when a species declines in numbers gradually. Even before man's arrival on Earth, some species had died out quite 2.(natural).

The ease of the dinosaurs is3.most well-known example of natural extinction.4.(they) disappearance is a natural one and new species of animals evolve (進化）to replace them.

The rate of extinction 5.(speed) up unnaturally over the last 400 years.6.(rise) sharply since 1900. This increase in the rate of extinction is directly related 7.the increase in the human population over the same period of time. Vast numbers of humans have caused great damage to the planet, as humans have taken over a great many wild 8.(habitat), forcing animals and plants into smaller and9.(small) areas, until some of them have become extinct. We have also polluted our planet.10.makes it unfit for wildlife. These causes of extinction are known as indirect destruction.

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