The world’s rainforests are an extremely valuable natural resource，to be sure, but not for their lumber or their land. They are the main cradle of life on Earth，and they hold millions of unique life forms that we have yet to discover. Destroying the rainforests is comparable to destroying an unknown planet—we have no idea what we’re losing. If deforestation continues at its current rate，the world’s tropical rainforests will be wiped out within 40 years.
1. Virtually all plant and animal species on Earth can be found in tropical rainforests.
2. There is not much change in the weather in the tropical rainforests all the year round.
3. The largest number of rainforests in the world are located on the African continent.
4. Below the canopy level of a tropical rainforest grows an overabundance of plants.
5. New tree seedlings will not survive to reach the canopy level unless .
6. Epiphytes，
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