Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 43 to 50.It is estimated that over 99 percent of all species that ever 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 ...
Phạm Văn Bắc | Chat Online | |
02/09 11:36:19 (Tiếng Anh - Lớp 12) |
Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 43 to 50.
It is estimated that over 99 percent of all species that ever 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 adapted. 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 million 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 extinctions 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, even affect 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 intense every 26 million years. The 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 revolutionary history may reflect a sequence of essentially random events.
The word "demise" is closest in meaning to ________.
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. change | 1 phiếu (100%) |
B. help 0 % | 0 phiếu |
C. recovery 0 % | 0 phiếu |
D. death 0 % | 0 phiếu |
Tổng cộng: | 1 trả lời |
Trắc nghiệm liên quan
- Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 43 to 50.It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 43 to 50.It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 43 to 50.It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
- Read the following pasage and mark the letter A,B,C or D to indicate the correct answer to each of the questions from 36 to 42.A rather surprising geographical feature of Antarctica is that a huge freshwater, one of the world's largest and deepest, ... (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Trong các phát biểu sau đây phát biểu nào không là mệnh đề. (Tin học)
- Số xâu khác nhau có thể tạo được từ các chữ cái của từ ORONO là: (Tin học)
- Cho quan hệ R = {(a,b) | a|b}trên tập số nguyên dương. Hỏi R KHÔNG có tính chất nào? (Tin học)
- Câu nào sau đây KHÔNG là một mệnh đề? (Tin học)
- Phương trình x + y + z = 15 có số nghiệm nguyên không âm là: (Tin học)
- Cho đồ thị G có 5 đỉnh có bậc lần lượt là 2, 2, 3, 4, 5. Bậc của đồ thị G là: (Tin học)
- Một cây có ít nhất mấy đỉnh treo? (Tin học)
- Cho đồ thị G có 9 đỉnh có bậc lần lượt là 1, 2, 2, 3, 3, 4, 4, 4, 5. Số cạnh của đồ thị G là: (Tin học)
- Cho đồ thị G có bậc là 10. Số cạnh của đồ thị G là: (Tin học)
- Chọn phát biểu nào sau đây là chính xác nhất: (Tin học)