The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species. Which one of the following is most strongly supported by the statements above, if they are true?

A. All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.
B. Few species of animals live on a part of the earth’s surface that is not threatened by holes in the ozone layer.
C. Some species of animals have eyes that will not suffer any damage when exposed to unfiltered sunlight.
D. A single wavelength of sunlight can cause severe damage to the eyes of most species of animals.
E. Some wavelengths of sunlight that cause eye damage are more likely to reach the earth’s surface where there are holes in the ozone layer than where there are not.

Powerscore CR Bible Answer

C is said to be wrong because "many species" may mean "all species". Please explain.

If I say I have 10 balls and many balls are red. Can't I be sure that some will not be red?

+1 E

Yes, "all" MAY include "many".
For example, if you have 100 balls, "many" could be 50 or 100 balls. In both cases, they are a lot! It is an ambiguous term. In this sense, you must be careful of what "many" could mean.

However, I think that " many " is not critical to eliminate C. "Any" is most important in that choice.

I think I deserve kudos
_________________

"Life’s battle doesn’t always go to stronger or faster men; but sooner or later the man who wins is the one who thinks he can."

My Integrated Reasoning Logbook / Diary: my-ir-logbook-diary-133264.html

Find out what's new at GMAT Club - latest features and updates

There is a gap in reasoning of how the lights may effect the eye sight of some species.
Hence a supporter answer choice is needed here which fills the gap.

Paraphrase : how the regions where there are holes are more problematic than regions where there are no holes in Ozone layer ?
Answer to this will suffice the argument.

Between D and E,

E gives a clear answer. Also negating E will make the conclusion falls too.
Hence E is an assumption answer choice too.
_________________

Visit -- http://www.sustainable-sphere.com/
Promote Green Business,Sustainable Living and Green Earth !!