The second paragraph in the passage serves primarily to_出国考试答疑器_GMAT

The second paragraph in the passage serves primarily to

A、outline the significance of the 1981 discovery of conodont remains to the debate concerning the development of the vertebrate skeleton

B、contrast the traditional view of the development of the vertebrate skeleton with a view derived from the 1981 discovery of conodont remains

C、contrast the characteristics of the ostracoderms with the characteristics of earlier soft-bodied vertebrates

D、explain the importance of the development of teeth among the earliest vertebrate predators

E、present the two sides of the debate concerning the development of the vertebrate skeleton

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