Question : Comprehension: An endangered species is a type of organism that is threatened by extinction. Species become endangered for two main reasons: loss of habitat and loss of genetic variation. A loss of habitat can happen naturally. Dinosaurs, for instance, lost their habitat about 65 million years ago. The hot, dry climate of the Cretaceous period changed very quickly, most likely because of an asteroid striking the Earth. The impact of the asteroid forced debris into the atmosphere, reducing the amount of heat and light that reached Earth's surface. The dinosaurs were unable to adapt to this new, cooler habitat. Dinosaurs became endangered, then extinct. Human activity can also contribute to the loss of habitat. Development for housing, industry, and agriculture reduces the habitat of native organisms. This can happen in several different ways.
Development can directly eliminate habitat and native species. In the Amazon rainforest of South America, developers have cleared hundreds of thousands of acres. To "clear" a piece of land is to remove all trees and vegetation from it. The Amazon rainforest is cleared for cattle ranches, logging, and urban use. Development can also endanger species indirectly. Some species, such as fig trees in the rainforest, may provide habitat for other species. As trees are destroyed, species that depend on that tree habitat may also become endangered. Tree crowns provide habitat in the canopy, or top layer, of a rainforest. Plants such as vines, fungi such as mushrooms, and insects such as butterflies live in the rainforest canopy. So do hundreds of species of tropical birds and mammals, such as monkeys. As trees are cut down, this habitat is lost. Species have less room to live and reproduce.
Based on the passage above, choose the correct option for the following question.
Question
According to the passage, which of the following is the likely reason for the dinosaurs becoming endangered and then extinct?
Option 1: Earthquakes
Option 2: Asteroid striking the Earth
Option 3: Tsunami
Option 4: Volcanic eruptions
Correct Answer: Asteroid striking the Earth
Solution : The right choice is the second option (refer to the first paragraph) .
According to the passage, the likely reason for the dinosaurs becoming endangered and then extinct was the change in their habitat caused by an asteroid striking the Earth. This event led to a significant alteration in the climate, as debris from the asteroid's impact reduced the amount of heat and light reaching Earth's surface, resulting in a cooler habitat that the dinosaurs could not adapt to.
Therefore, the right answer is an asteroid striking the Earth.
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Question : Comprehension: An endangered species is a type of organism that is threatened by extinction. Species become endangered for two main reasons: loss of habitat and loss of genetic variation. A loss of habitat can happen naturally. Dinosaurs, for instance,
Question : Which statement is true? A: Horticulture is a branch of agriculture related to the management and care of farm animals such as cattle, sheep, pigs, and goats. B: Sustainable development requires the application of environmentally beneficial technologies, such as
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