TAILIEUCHUNG - 1995-2000 Reading Full Test phần 2

Tham khảo tài liệu '1995-2000 reading full test phần 2', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Questions 32-40 Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity the number of species in a particular ecosystem to the health of the Earth and human well-being. Much has been written about the diversity of terrestrial organisms particularly the exceptionally rich life associated with tropical rain-forest habitats. Relatively little has been said however about diversity of life in the sea even though coral reef systems are comparable to rain forests in terms of richness of life. An alien exploring Earth would probably give priority to the planet s dominants most-distinctive feature-the ocean. Humans have a bias toward land that sometimes gets in the way of truly examining global issues. Seen from far away it is easy to realize that landmasses occupy only one-third of the Earth s surface. Given that two-thirds of the Earth s surface is water and that marine life lives at all levels of the ocean the total three-dimensional living space of the ocean is perhaps 100 times greater than that of land and contains more than 90 percent of all life on Earth even though the ocean has fewer distinct species. The fact that half of the known species are thought to inhabit the world s rain forests does not seem surprising considering the huge numbers of insects that comprise the bulk of the species. One scientist found many different species of ants in just one tree from a rain forest. While every species is different from every other species their genetic makeup constrains them to be insects and to share similar characteristics with 750 000 species of insects. If basic broad categories such as phyla and classes are given more emphasis than differentiating between species then the greatest diversity of life is unquestionably the sea. Nearly every major type of plant and animal has some representation there. To appreciated fully the diversity and abundance of life in the sea it .

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