Possible Explanation:
1.Which of the following would serve as an example of “concomitant structural features” (line 13) that might disadvantage a snail of the rarer form?
According to passage question:
Their shapes are noticeably different. Sinistral rarity might, then, be a consequence of possible disadvantages conferred by these other concomitant structural features.
The answer focuses on shape:
ANS: D states something about shape
2.The second paragraph of the passage is primarily concerned
...
1.Which of the following would serve as an example of “concomitant structural features” (line 13) that might disadvantage a snail of the rarer form?
According to passage question:
Their shapes are noticeably different. Sinistral rarity might, then, be a consequence of possible disadvantages conferred by these other concomitant structural features.
The answer focuses on shape:
ANS: D states something about shape
2.The second paragraph of the passage is primarily concerned
...







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