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# Since a bird's body temperature can increase as much as 10

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Since a bird's body temperature can increase as much as 10 [#permalink]

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02 Dec 2012, 10:04
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Since a bird's body temperature can increase as much as 10 degrees Fahrenheit during long, strenuous flights, birds are in danger of overheating during the prolonged flights typical of seasonal migrations. This risk is greater during daylight hours than at night, because air temperatures are generally lower at night. It is, therefore, likely that the tendency of many bird species to migrate at night is due to the need to avoid overheating.

Which of the following, if true, most strengthens the argument given?

A. Birds that migrate in warmer months are more likely to migrate at night than are those that migrate in colder months.
B. Birds that migrate during the daytime are in danger of being blown off course by atmospheric turbulence, which is strongest during daylight hours.
C. Birds that begin to overheat during migration can lower their body temperature significantly by briefly stopping to rest.
D. Nighttime migration enables birds to avoid certain predators by flying in the dark and remaining hidden during the daylight hours.
E. Nighttime migration enables birds to forage by daylight, when they can most readily find food.

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Re: Since a bird's body temperature can increase as [#permalink]

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02 Dec 2012, 10:18
ritumaheshwari02 wrote:
Since a bird's body temperature can increase as much as 10 degrees Fahrenheit during long, strenuous flights, birds are in danger of overheating during the prolonged flights typical of seasonal migrations. This risk is greater during daylight hours than at night, because air temperatures are generally lower at night. It is, therefore, likely that the tendency of many bird species to migrate at night is due to the need to avoid overheating.

Which of the following, if true, most strengthens the argument given?

A. Birds that migrate in warmer months are more likely to migrate at night than are those that migrate in colder months.
B. Birds that migrate during the daytime are in danger of being blown off course by atmospheric turbulence, which is strongest during daylight hours.
C. Birds that begin to overheat during migration can lower their body temperature significantly by briefly stopping to rest.
D. Nighttime migration enables birds to avoid certain predators by flying in the dark and remaining hidden during the daylight hours.
E. Nighttime migration enables birds to forage by daylight, when they can most readily find food.

D and E weaken the argument by providing an alternative explanation.
C is irrelevant.
B is irrelevant.
A is correct in that it gives a fact that further strengthens the argument.
+1 A
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Re: Since a bird's body temperature can increase as much as 10 [#permalink]

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13 Dec 2012, 20:39
ritumaheshwari02 wrote:
Since a bird's body temperature can increase as much as 10 degrees Fahrenheit during long, strenuous flights, birds are in danger of overheating during the prolonged flights typical of seasonal migrations. This risk is greater during daylight hours than at night, because air temperatures are generally lower at night. It is, therefore, likely that the tendency of many bird species to migrate at night is due to the need to avoid overheating.

Which of the following, if true, most strengthens the argument given?

A. Birds that migrate in warmer months are more likely to migrate at night than are those that migrate in colder months.
Correct, as in warmer months more birds migrate in night thereby showing the importance of day temperatures in overheating that is not the case in colder months when the temperature is low in day time also i.e. day time(colder) < day time(hot months).
B. Birds that migrate during the daytime are in danger of being blown off course by atmospheric turbulence, which is strongest during daylight hours.
Atmospheric turbulence O.O.S(out of scope)
C. Birds that begin to overheat during migration can lower their body temperature significantly by briefly stopping to rest.
contrary it weakens the conclusion
D. Nighttime migration enables birds to avoid certain predators by flying in the dark and remaining hidden during the daylight hours.
Weakens , tendency in conclusion is due to overheating here it mentions an alternative cause for the stated effect.
E. Nighttime migration enables birds to forage by daylight, when they can most readily find food.

O.O.S

IMO : Answer should be (A). the best in the lot
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Re: Since a bird's body temperature can increase as much as 10 [#permalink]

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14 Dec 2012, 11:07
IMO its A

Boil down the argument to a sentence:- Birds migrating in warmer weather fly during day time.

B,C,D and E provide advantages or explanation for flying during night time or day time.

Hence A is the best choice remaining.

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Re: Since a bird's body temperature can increase as [#permalink]

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14 Dec 2012, 18:44
Marcab wrote:
ritumaheshwari02 wrote:
Since a bird's body temperature can increase as much as 10 degrees Fahrenheit during long, strenuous flights, birds are in danger of overheating during the prolonged flights typical of seasonal migrations. This risk is greater during daylight hours than at night, because air temperatures are generally lower at night. It is, therefore, likely that the tendency of many bird species to migrate at night is due to the need to avoid overheating.

Which of the following, if true, most strengthens the argument given?

A. Birds that migrate in warmer months are more likely to migrate at night than are those that migrate in colder months.
B. Birds that migrate during the daytime are in danger of being blown off course by atmospheric turbulence, which is strongest during daylight hours.
C. Birds that begin to overheat during migration can lower their body temperature significantly by briefly stopping to rest.
D. Nighttime migration enables birds to avoid certain predators by flying in the dark and remaining hidden during the daylight hours.
E. Nighttime migration enables birds to forage by daylight, when they can most readily find food.

D and E weaken the argument by providing an alternative explanation.
C is irrelevant.
B is irrelevant.
A is correct in that it gives a fact that further strengthens the argument.
+1 A

Marcab,

Doesn't A seems to be too far? speaks only about warmer months and colder months?

Since argument speaks about "It is, therefore, likely that the tendency of many bird species to migrate at night is due to the need to avoid overheating."

It says some effect is stronger in daytime, so birds prefer night time.

Can any one comment on this?
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Re: Since a bird's body temperature can increase as much as 10 [#permalink]

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15 Dec 2012, 00:04
A. Birds that migrate in warmer months are more likely to migrate at night than are those that migrate in colder months.- It’s a fact which strengthens the conclusion that birds migrate at night in order to avoid overheating.
B. Birds that migrate during the daytime are in danger of being blown off course by atmospheric turbulence, which is strongest during daylight hours. – This is out of scope as it is talking about atmospheric turbulence and not about overheating.
C. Birds that begin to overheat during migration can lower their body temperature significantly by briefly stopping to rest. – This is again out of scope as not related to conclusion.
D. Nighttime migration enables birds to avoid certain predators by flying in the dark and remaining hidden during the daylight hours. – Mention of Predators weakens the argument as it gives the alternative explanation that overheating is not the reason behind night time migration.
E. Nighttime migration enables birds to forage by daylight, when they can most readily find food.- it weakens the argument as it gives the alternative explanation that overheating is not the reason behind night time migration.

So ‘A’ is the correct option.
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Re: Since a bird's body temperature can increase as much as 10 [#permalink]

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07 Jan 2013, 06:40
Night time migration to avoid overheating

Look for strengthener...

B. alternative explanation is a weakener
C. another measure to avoid overheating doesn't weaken and doesn't.t strengthen... Neutral...
D. alternative explanation is a weakener
E. alternative explanation is a weakener

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Re: Since a bird's body temperature can increase as much as 10 [#permalink]

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26 Jul 2014, 19:48
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Re: Since a bird's body temperature can increase as much as 10   [#permalink] 26 Jul 2014, 19:48
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