Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species' death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures ...
Tôi yêu Việt Nam | Chat Online | |
04/09 16:53:35 (Tiếng Anh - Lớp 12) |
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions
It is estimated that over 99 percent of all species that have existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species' death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.
The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions, many species became extinct at the same time- a mass extinction. One of the best-known examples of mass extinction occurred 65 mmion years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affecting even organisms not living in the oceans. Such a change would probably lead to a mass extinction.
One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intensive every 26 million years. This periodic extinction might be due to intersection of the Earth's orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species' survival may have nothing to do with its ability or inability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.
Which of the following can be inferred from the theory of periodic extinction mentioned in paragraph 3?
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. The theory is no longer seriously considered 0 % | 0 phiếu |
B. Many scientists could be expected to disagree with it 0 % | 0 phiếu |
C. Most scientists believe the theory to be accurate 0 % | 0 phiếu |
D. Evidence to support the theory has recently been found 0 % | 0 phiếu |
Tổng cộng: | 0 trả lời |
Tags: Read the following passage and mark the letter A. B. C or D on your answer sheet to indicate the correct answer to each of the questions,Which of the following can be inferred from the theory of periodic extinction mentioned in paragraph 3?
Trắc nghiệm liên quan
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions It is estimated that over 99 percent of all species that have existed have become extinct. What causes ... (Tiếng Anh - Lớp 12)
- Peter lost the race because he ______ petrol on the last lap. (Tiếng Anh - Lớp 12)
- Being helpful is good, but don't allow others to _______ advantage of your generosity. (Tiếng Anh - Lớp 12)
- After a six-year relation, Martha and Billy have decided to ________ . (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Theo GS. Trần Ngọc Thêm, ăn, mặc, ở, đi, lại là những yếu tố thuộc thành tố văn hóa nào? (Tổng hợp - Đại học)
- Xác định loại hình kinh tế - văn hóa dựa trên: (Tổng hợp - Đại học)
- Câu tục ngữ: “Giặc đến nhà đàn bà cũng đánh” là biểu hiện của: (Tổng hợp - Đại học)
- Schools are offering educational programs to have children _______ about the importance of conservation. (Tiếng Anh - Lớp 12)
- Bản chất của văn hóa được xem xét trong mối quan hệ: (Tổng hợp - Đại học)
- The more we understand the power of mass media, _______ we can use it for positive change. (Tiếng Anh - Lớp 12)
- Cách xác định các yếu tố cấu thành chỉnh thể văn hóa dựa trên nguyên tắc: (Tổng hợp - Đại học)
- Preserving natural habitats is key to protect biodiversity, _______ ultimately benefits all living things. (Tiếng Anh - Lớp 12)
- ASEAN is a growing and influential organisation that is playing _______ increasingly important role in the world. (Tiếng Anh - Lớp 12)
- Văn hóa thực hiện được chức năng của nó khi nó vận hành với tính cách là: (Tổng hợp - Đại học)