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18 May 2026, 22:57
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Difficulty:
85%
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Question Stats:
49% (01:47) correct
51%
(01:41)
wrong
based on 240
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The number of deer living in North America has increased dramatically since the 1960s even though hunters kill no fewer deer today. Moreover, the number of natural predators of deer, such as wolves, is on the rise, and suburbs increasingly encroach on deer habitats.
Which one of the following, if true, would most help to explain the apparent discrepancy described above?
(A) Pesticides that adversely affected most wildlife living in North America have been banned since the 1970s.
(B) Recently, attempts have been made in various parts of North America to protect deer habitats from suburban development.
(C) The number of deer hunters in North America has decreased since the 1960s.
(D) Much of the increase in the population of wolves is due to wolves born in captivity and released into the wild.
(E) The greater the number of deer, the more likely they are to be afflicted with problems such as famine and disease.
Which one of the following, if true, would most help to explain the apparent discrepancy described above?
(A) Pesticides that adversely affected most wildlife living in North America have been banned since the 1970s.
(B) Recently, attempts have been made in various parts of North America to protect deer habitats from suburban development.
(C) The number of deer hunters in North America has decreased since the 1960s.
(D) Much of the increase in the population of wolves is due to wolves born in captivity and released into the wild.
(E) The greater the number of deer, the more likely they are to be afflicted with problems such as famine and disease.
19 May 2026, 05:15
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The number of deer living in North America has increased dramatically since the 1960s even though hunters kill no fewer deer today. Moreover, the number of natural predators of deer, such as wolves, is on the rise, and suburbs increasingly encroach on deer habitats.
Which one of the following, if true, would most help to explain the apparent discrepancy described above?
The puzzle is that the deer population has increased dramatically even though hunting has not decreased, predators have increased, and habitat has been reduced. The best explanation should identify another factor that could have improved deer survival or reproduction enough to outweigh these negative pressures.
(A) Pesticides that adversely affected most wildlife living in North America have been banned since the 1970s.
Correct. “Since the 1960s” refers to the entire period beginning in the 1960s and continuing afterward. If harmful pesticides were banned in the 1970s, an important factor limiting deer survival or reproduction was removed for much of that period. This could have outweighed the effects of hunting, predators, and habitat loss and helped produce the dramatic population increase.
(B) Recently, attempts have been made in various parts of North America to protect deer habitats from suburban development.
Incorrect. The passage says suburban development has continued to reduce deer habitat. Protecting some habitat merely means that the habitat loss may have been less severe than it otherwise would have been. That does not explain why the deer population increased dramatically.
(C) The number of deer hunters in North America has decreased since the 1960s.
Incorrect. The passage already tells us that hunters kill no fewer deer today. So fewer hunters would simply mean that the remaining hunters kill more deer on average. It does not explain the population increase.
(D) Much of the increase in the population of wolves is due to wolves born in captivity and released into the wild.
Incorrect. Regardless of where the additional wolves came from, there are still more wolves in the wild that can prey on deer. This does not explain the increase in deer.
(E) The greater the number of deer, the more likely they are to be afflicted with problems such as famine and disease.
Incorrect. This gives another factor that should limit deer population growth, making the discrepancy harder rather than easier to explain.
Answer: (A)
Which one of the following, if true, would most help to explain the apparent discrepancy described above?
The puzzle is that the deer population has increased dramatically even though hunting has not decreased, predators have increased, and habitat has been reduced. The best explanation should identify another factor that could have improved deer survival or reproduction enough to outweigh these negative pressures.
(A) Pesticides that adversely affected most wildlife living in North America have been banned since the 1970s.
Correct. “Since the 1960s” refers to the entire period beginning in the 1960s and continuing afterward. If harmful pesticides were banned in the 1970s, an important factor limiting deer survival or reproduction was removed for much of that period. This could have outweighed the effects of hunting, predators, and habitat loss and helped produce the dramatic population increase.
(B) Recently, attempts have been made in various parts of North America to protect deer habitats from suburban development.
Incorrect. The passage says suburban development has continued to reduce deer habitat. Protecting some habitat merely means that the habitat loss may have been less severe than it otherwise would have been. That does not explain why the deer population increased dramatically.
(C) The number of deer hunters in North America has decreased since the 1960s.
Incorrect. The passage already tells us that hunters kill no fewer deer today. So fewer hunters would simply mean that the remaining hunters kill more deer on average. It does not explain the population increase.
(D) Much of the increase in the population of wolves is due to wolves born in captivity and released into the wild.
Incorrect. Regardless of where the additional wolves came from, there are still more wolves in the wild that can prey on deer. This does not explain the increase in deer.
(E) The greater the number of deer, the more likely they are to be afflicted with problems such as famine and disease.
Incorrect. This gives another factor that should limit deer population growth, making the discrepancy harder rather than easier to explain.
Answer: (A)
09 Aug 2026, 07:15
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OE for reference:
Overview:
The passage says that the deer population has increased dramatically since the 1960s despite several factors that would make us think that the deer population would have either remained stable or decreased.
The question asks you to identify a fact that would most help to explain how the population of deer could have increased in spite of these factors.
The Correct Answer:
A Deer are wildlife, so if pesticides that adversely affect most wildlife have been banned since the 1970s, that could explain why the deer population has increased since then. An adverse condition that may have prevented the deer population from growing has been removed, which could outweigh the factors that tend to limit population growth.
The Incorrect Answer Choices:
B We want to find something that could help to explain why the deer population has increased. The passage says that the suburbs are increasingly encroaching on deer habitats, so some habitat loss has occurred. Therefore, the attempts to protect deer habitats from suburban development described in (B) have, if anything, merely prevented that habitat loss from being worse than it was. But the fact that the habitat loss could have been worse does not help to explain why the deer population has dramatically increased.
C The passage says that hunters kill as many deer now as they used to, so (C) just implies that the average hunter now kills more deer than before. This does not help explain why deer populations have increased.
D (D) does not do anything to neutralize the fact that wolf populations have increased. Even if the increase in the wolf population is the result of wolves raised in captivity and released into the wild, the predation by wolves would not be expected to decrease with an increase in the wolf population, so (D) would provide no help in explaining why the deer population has increased.
E (E) does not help to explain why the deer population has increased. It suggests that population increases might be self-limiting or even cyclical. If anything, this would indicate another adverse condition that we would expect to prevent the deer population from increasing.
Overview:
The passage says that the deer population has increased dramatically since the 1960s despite several factors that would make us think that the deer population would have either remained stable or decreased.
The question asks you to identify a fact that would most help to explain how the population of deer could have increased in spite of these factors.
The Correct Answer:
A Deer are wildlife, so if pesticides that adversely affect most wildlife have been banned since the 1970s, that could explain why the deer population has increased since then. An adverse condition that may have prevented the deer population from growing has been removed, which could outweigh the factors that tend to limit population growth.
The Incorrect Answer Choices:
B We want to find something that could help to explain why the deer population has increased. The passage says that the suburbs are increasingly encroaching on deer habitats, so some habitat loss has occurred. Therefore, the attempts to protect deer habitats from suburban development described in (B) have, if anything, merely prevented that habitat loss from being worse than it was. But the fact that the habitat loss could have been worse does not help to explain why the deer population has dramatically increased.
C The passage says that hunters kill as many deer now as they used to, so (C) just implies that the average hunter now kills more deer than before. This does not help explain why deer populations have increased.
D (D) does not do anything to neutralize the fact that wolf populations have increased. Even if the increase in the wolf population is the result of wolves raised in captivity and released into the wild, the predation by wolves would not be expected to decrease with an increase in the wolf population, so (D) would provide no help in explaining why the deer population has increased.
E (E) does not help to explain why the deer population has increased. It suggests that population increases might be self-limiting or even cyclical. If anything, this would indicate another adverse condition that we would expect to prevent the deer population from increasing.
