Hi
CAMANISHPARMARYou asked me to weigh in on this one so I will give you my thoughts. There are already some great explanations above.
Basically, we are looking for something that describes why replacing these lights is going to be a BIG PROBLEM for the bats.
It needs to be a life-threatening problem, because the argument says the change will likely result in a
population decline. Population decline means existing bats die off and/or the next generations of bats are smaller.
What could cause such a thing?
Hmm, 2 big categories come to mind:
a shortage of any of the essentials a bat needs to survive (food, nesting grounds, etc), or the
presence of a killer such as a disease or a predator. (A natural disaster would be another option, though I don't foresee that coming into play here.)
So I could go for any answer that gives me a shortage of essentials or the presence of a killer.
For best results, we have this all in mind BEFORE we go shopping through the answer choices for an answer that meets our needs.
No answer choices give us a killer. And only one of our answer choices could lead to a shortage of essentials. D describes that bats are going to be working way harder than before to find enough food to eat, and as a result, they're going to suddenly need more food. If they can't find that additional food, they will die ... and/or not be able to feed the same number of baby bats as before, thus reducing the next generation.
It is not 100% sure that they won't be able to find additional food, but as
GMATNinja and
dave13 have mentioned, 1) we don't have to be 100% sure (the question says "likely"), and 2) there is a finite existing insect population. It's reasonable to envision that there will not be enough insects to feed the bats' increased appetite.
Let me know if this helps.
- Thanks for taking the time out for giving your inputs. I appreciate the essence of your post.
(D) Correct. Since there will be
, and that their local population will therefore fall.
I think it is supposed to be interpreted in a very simple manner, i.e. some thing which was easily available will no longer be easily available, that's it!! The Bats will have to search more, and that means more energy is consumed. Already they are hungry as the food source is not easily available, more hunger due to energy usage makes things worse for Bats and maybe that's why the bats will starve. As you rightly pointed out the author used subtle language here, "1) we don't have to be 100% sure (the question says "likely")".....and just find one reason to answer why the Bat population MIGHT go down?.....shouldn't this interpretation be sufficient to choose D!!
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