Read the article again. Answer the questions. 1. Why has the Voronya Cave not been completely explored? 2. Why is more known about the caves in Europe, the USA and Australia than those in other parts of the world? 3. For what two reasons is the deep ocean difficult for people to explore? 4. How much of the ocean floor remains unexplored? 5. Why is the Amazon rainforest so interesting for biologists? 6. What's special about the animals and plants that exist in deserts?

The article is needed to answer these questions exactly. Without it, I can only give general answers, and they may not match the text.

In general, Voronya Cave has not been completely explored because it is extremely deep, dangerous and technically difficult to reach. Caves in Europe, the USA and Australia are usually better known because they have been studied longer and there is more money, equipment and access for researchers. The deep ocean is hard to explore because of huge water pressure and complete darkness. A large part of the ocean floor still remains unexplored. The Amazon rainforest is interesting for biologists because it has enormous biodiversity: many species of animals and plants live there, including species still unknown to science. Desert plants and animals are special because they can survive with very little water and in extreme heat or cold.

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