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Question:

Which sentence blurs the focus of the last paragraph and should therefore be deleted?

A Sentence 17
Explaination

The main focus of the last paragraph is on C. rechenbergi’s form of movement, making sentence 17’s reference to the spiders’ reproductive organs irrelevant at that point in the passage.
The other choices are incorrect because sentences 14, 15, and 16 contribute relevant information consistent with the main focus of the last paragraph on C. rechenbergi’s form of movement.