Read the passage and choose the best answer for each question below.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 able to adapt. Food Resources may ...
Nguyễn Thị Sen | Chat Online | |
04/09 18:20:32 (Tiếng Anh - Lớp 12) |
Read the passage and choose the best answer for each question below.
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 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 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, affection 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 intense 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 tat 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 is NOT mentioned in paragraph 1 as resulting from rapid ecological change?
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. Temperature changes 0 % | 0 phiếu |
B. Availability of food resources 0 % | 0 phiếu |
C. Introduction of new species 0 % | 0 phiếu |
D. Competition among species 0 % | 0 phiếu |
Tổng cộng: | 0 trả lời |
Trắc nghiệm liên quan
- Read the passage and choose the best answer for each question below.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 ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer for each question below.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 ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer for each question below.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 ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 44 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 43 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 42 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 41 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 40 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 39 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
- Read the passage and choose the best answer among A,B,C,D for each gap to complete it. Fill in the appropriate word in question 38 Most people feel that when they dream, they are (35)________ off to another world. On the (36)________, dreams are ... (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Dialogue completion: Choose A, B, C, or D to complete each dialogue. Mike: You’ve been working out regularly, haven’t you? Nhung: _____________ (Tổng hợp - Lớp 12)
- You can’t just bury your head in the sand and hope that this problem goes away, you know. (Tổng hợp - Lớp 12)
- Antonyms: Choose A, B, C, or D that has the OPPOSITE meaning to the underlined word/ phrase in each question. Why do you always contradict me and say that what I’m saying isn’t true? (Tổng hợp - Lớp 12)
- ‘I want each and every one of you here to put forward as many suggestions as possible’, said the boss bossily. (Tổng hợp - Lớp 12)
- Synonyms: Choose A, B, C, or D that has the CLOSEST meaning to the underlined word/ phrase in each question. The outer structure of the building has been completely renovated and the interior decorators will be starting inside next week. (Tổng hợp - Lớp 12)
- At the end of the performance, the audience _______ the cast of Mamma Mia! by giving them a standing ovation. (Tổng hợp - Lớp 12)
- You should _______ a professional to check your house for earthquake damage, just to be sure there’re no hidden cracks that could cause problems later. (Tổng hợp - Lớp 12)
- If the school _______ aren’t written down anywhere, how are students supposed to know what they are to follow? (Tổng hợp - Lớp 12)
- Tom Cruise wouldn’t be the star he is today _______ made a good impression in his early films. (Tổng hợp - Lớp 12)
- Pia has always wanted to be a travel _______ and take pictures of exotic places. (Tổng hợp - Lớp 12)