15. Look at the four squares[■ ] that indicate where the following sentence can be added to the passage. "This is a question that has puzzled scientists for ages." Where would the sentence best fit? (A)1(B)2(C)3(D)4

13.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? (A) Even though Ambulocetus swam by moving its bodv up and down. it did not have a backhonp (B) The backbone of Ambulocetus, which allowed it to swim, provides evidence of its missing fluke. (C) Although Ambulocetus had no fluke, its backbone structure shows that it swam like modern whales.

15. Look at the four squares[■ ] that indicate where the following sentence can be added to the passage. "This is a question that has puzzled scientists for ages." Where would the sentence best fit?
(A)1
(B)2
(C)3
(D)4

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