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snoor
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snoor
An imperfection of curvature found in the corneas of almost every human being, stars seem to twinkle because their light is distorted by astigmatism on its way to the optic nerve.


A An imperfection of curvature found in the corneas of almost every human being, stars seem to twinkle because their light is distorted by astigmatism on its way to the optic nerve.

B An imperfection of curvature found in the corneas of almost every human being, astigmatism distorts the light of stars as that light passes to the optic nerve, making them seem to twinkle.

C Found in the corneas of almost every human being as an imperfection of curvature, stars seem to twinkle because their light is distorted by astigmatism on its way to the optic nerve.

D The light of stars, found in the corneas of almost every human being as an imperfection of curvature, is distorted by astigmatism on its way to the optic nerve, making them seem to twinkle.

E The light of stars, by astigmatism, an imperfection of curvature found in the corneas of almost every human being, distorts it as it passes to the optic nerve, making them seem to twinkle.

Although I also think it's B, I am not certain how "them" refers to "stars" here (although I understand that no other subject/object is plural).



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