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Re: V01-30 [#permalink]
I don’t understand why D is incorrect
If salmon leave without sufficiently feeding on insects, won’t they reduce their nutrition and die out?
It is unclear whether the purpose of feeding is to reduce number of insects or to get enough food

I was confused between C and D. I reasoned that in c, butterflies will still be able to hatch caterpillars and metamorpihize into butterflies at the same rate as before, it just won’t increase. So there will not be any extinction.

Please let me know if this is a valid thought process or if I’m missing something

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Re: V01-30 [#permalink]
Bunuel sayantanc2k

Option A - Squirrel and chipmunk species are unable either to consume or (unable) to store all the nuts and berries produced during a longer growing season.

Since they are unable to store during longer season won't it affect them that at some point in time since there is no food available, they will die of hunger?
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Re: V01-30 [#permalink]
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Rickooreo wrote:
Bunuel sayantanc2k

Option A - Squirrel and chipmunk species are unable either to consume or (unable) to store all the nuts and berries produced during a longer growing season.

Since they are unable to store during longer season won't it affect them that at some point in time since there is no food available, they will die of hunger?


Hi. Happy to address.

The short answer is that this information is not supporting the argument. T even opposite, this choice implies there will more food available, so much more that it won’t be collected or consumed.

The long answer is that no one knows how many nuts or berries are produced in the regular season in the entire universe or how many are needed or consumed. The squirrels and chipmunks are definitely not able to consume or store all millions of tons.

Let’s imagine that in a certain area, on a certain continent in a regular summer, 3,000,000,000,000 tons of berries and nuts, a grown. Let’s imagine if the summer season is longer, and for some reason, chipmunks and squirrels are not able to store or preserve this entire crop. We don’t know if they’re not able to store one percent or 99%. Similarly, if the growing season is longer, it almost seems like they should be able to store or consume more but again that’s completely irrelevant, in this case Since it is not adversely affecting them. This information does not really help us answer the question of extinction.

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Re: V01-30 [#permalink]
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Hiral777 wrote:
I don’t understand why D is incorrect
If salmon leave without sufficiently feeding on insects, won’t they reduce their nutrition and die out?
It is unclear whether the purpose of feeding is to reduce number of insects or to get enough food

I was confused between C and D. I reasoned that in c, butterflies will still be able to hatch caterpillars and metamorpihize into butterflies at the same rate as before, it just won’t increase. So there will not be any extinction.

Please let me know if this is a valid thought process or if I’m missing something

Posted from my mobile device


I had the same doubt earlier on these 2 choices.
After a closer look at c, "bird species have hatched their young, which feed exclusively on caterpillars." This implies that the birds' young will have nothing to eat since they feed exclusively on caterpillars which fly away earlier now.
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Re: V01-30 [#permalink]
I think this the explanation isn't clear enough, please elaborate.
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Re: V01-30 [#permalink]
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RuoChen wrote:
Hiral777 wrote:
I don’t understand why D is incorrect
If salmon leave without sufficiently feeding on insects, won’t they reduce their nutrition and die out?
It is unclear whether the purpose of feeding is to reduce number of insects or to get enough food

I was confused between C and D. I reasoned that in c, butterflies will still be able to hatch caterpillars and metamorpihize into butterflies at the same rate as before, it just won’t increase. So there will not be any extinction.

Please let me know if this is a valid thought process or if I’m missing something

Posted from my mobile device

I had the same doubt earlier on these 2 choices.
After a closer look at c, "bird species have hatched their young, which feed exclusively on caterpillars." This implies that the birds' young will have nothing to eat since they feed exclusively on caterpillars which fly away earlier now.

­
Hi. I will be happy to work on improving the explanation of this question. To answer existing questions about answer choices. Here is why D is wrong: 

D) Salmon species that rely on changes in temperature to signal the start of annual migrations leave their freshwater birthplaces earlier, before they have fed sufficiently on freshwater insects to reduce their number.


This option illustrates a disruption in the salmon's lifecycle due to changes in migration timing. While it suggests or hints at potential problems for salmon growth and development as the result of the disruption, it doesn't directly tie how this could lead to their extinction. All we know is that Salmon leave early but we don't know if it is good, bad, or irrelevant. Moreover, the statement about not feeding sufficiently on insects actually points to an ecological imbalance impacting insects, rather than the salmon. So this choice runs around the argument but does not really touch it

­
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Re: V01-30 [#permalink]
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BabitaLakhlan wrote:
I think this the explanation isn't clear enough, please elaborate.

Thanks for the question BabitaLakhlan - ­I have updated all of the explanations to add more logical reasoning and motivations for correct/incorrect judgement. Additional tips would be required for further elaboration. 

 
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Re: V01-30 [#permalink]
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