Read an Academic Passage Test #194
Read an Academic Passage
Biodiversity in the Amazon Rainforest
The Amazon rainforest, located in South America, is the largest tropical rainforest on Earth and a place of extraordinary biological diversity. It is home to an estimated 10 percent of the world's known species, encompassing millions of species of plants, insects, fish, amphibians, mammals, and birds. Many of these species remain undiscovered and uncatalogued by science. This incredible richness of life is supported by the region's stable climate, which is consistently warm and humid, providing ideal conditions for growth year-round.
One reason the Amazon can support such immense biodiversity is its complex physical structure. The rainforest is vertically stratified into several distinct layers: the forest floor, the understory, the canopy, and the emergent layer. Each layer provides a unique set of environmental conditions and resources, creating distinct habitats, or niches, for different species. This stratification minimizes competition, allowing a vast number of organisms to coexist. For example, some species of monkeys and birds spend their entire lives in the high canopy, while animals like the jaguar are adapted to life on the dark forest floor. This structure is key to its ability to sustain life.
Despite its vibrancy, the Amazon rainforest and its biodiversity are under severe threat. The primary driver of this threat is deforestation, largely for cattle ranching, agriculture, and logging. As the forest is cleared, countless species lose their habitats and are pushed toward extinction. This loss has global implications, as the Amazon plays a crucial role in regulating climate by absorbing vast amounts of carbon dioxide. Conservation efforts are in a race against time to protect this irreplaceable global treasure from further destruction.
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