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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.

1. What is the central topic of the passage?
A) The discovery of new species in the Amazon.
B) The role of the Amazon in regulating the global climate.
C) The Amazon's rich, layered biodiversity and the threats it faces.
D) The specific adaptations of animals living on the forest floor.
2. The word "sustain" in the passage is closest in meaning to
A) limit
B) observe
C) support
D) threaten
3. What can be inferred from the passage about competition for resources in the Amazon?
A) Competition is extremely high in all layers of the rainforest.
B) The layered structure of the rainforest helps reduce competition among species.
C) Only animals in the canopy layer have to compete for food.
D) There is no competition for resources anywhere in the Amazon.
4. According to the passage, what is the main reason for the loss of biodiversity in the Amazon?
A) Natural climate shifts
B) The spread of disease
C) A lack of undiscovered species
D) The clearing of forests by humans
5. What is the purpose of describing the different layers of the rainforest in the second paragraph?
A) To explain how so many different species can live in the same area.
B) To argue that the forest floor is the most important layer.
C) To detail the primary causes of deforestation.
D) To list all the animal species that live in the Amazon.

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