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QUESTION
140. Which of the following have a rudimentary backbone?
140. Which of the following have a rudimentary backbone? Placoderms 141. The fisheries of the Great Lakes were almost brought to a complete collapse as a result of the invasion of Lampreys 142. Placoderms were the first fishes to display A mineral hardened backbone and skull 143. Which of the following sequences correctly represents vertebrate evolution?
