Why is the tropical rain forest called "a paradise for biologists"?

AmazonRainForest is located in the Amazon basin of South America, covering an area of 7 million square kilometers. Rainforests span eight countries: Brazil (accounting for 60% of the forest area), Colombia, Peru, Venezuela, Ecuador, Bolivia, Guyana and Suriname, accounting for half of the world's rainforest area and 20% of the forest area. It is the largest and most diverse tropical rain forest in the world. The Amazon rainforest is called "the lung of the earth".

Amazon rainforest is the largest forest in the world, with dense forests and a wide variety of animals and plants. There is a "world rainforest", which appears in the tropics and is close to the equator. Abundant rain makes the forest grow particularly lush. Most of the tropical rain forests in the Amazon basin are located in Brazil. There is abundant rainfall here, and the melting of snow and ice in the Andes brings a lot of running water, which is flooded most of the year. The rain forest is muggy and humid almost all year round, with the temperature of about 33℃ during the day and 23℃ at night. The Amazon rain forest is the largest rain forest in the world, with 7 million square kilometers. It extends from the low slopes of the Andes to the Atlantic coast of Brazil. Amazon rainforest is very important to the health of the whole world and all living things in the world. This forest has a great influence on the world climate. Forests can absorb carbon dioxide. The abundance of carbon dioxide makes the earth warm, even the polar ice caps melt, causing floods. Trees also produce oxygen, which is necessary for human beings and all animals to live. The oxygen produced by Amazon rainforest accounts for 1/3 of the global total oxygen, and is called "the lung of the earth". The timber in this forest area accounts for 45% of the world's total timber reserves, with an accumulated timber volume of 800 million cubic meters and an economic value of more than 700 billion US dollars. Biological species account for 1/5 of the world, plant species and birds each account for half of the world, and fresh water resources account for 18% of the world. There are more than 2000 kinds of freshwater fish in the river, which is a very precious treasure house of biological resources for human beings. There are many kinds of wild animals in the Amazon Plain. At the end of the 9th century, according to a British naturalist, * * has14,712 species of animals, of which more than 8,000 species are unknown. There are now more than 65,438+million known species of animals and birds, and there may be millions more to be discovered. In the Amazon rainforest, about 60 different kinds of trees grow in an area equivalent to 8 ~ 10 houses and gardens. This is 15 times the number of trees in the same area of Europe or North America. The Amazon ecological zone accounts for 60% of Brazil's territory, with a forest area of 4 million square kilometers, of which rainforest accounts for 65%. Therefore, the impact of the Amazon river basin on the global climate and ecological environment is decisive.