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Author Question: Which of these might have been observed in the common ancestor of chondrichthyan (Read 772 times)

federox

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on: Aug 8, 2013
Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
A) a mineralized, bony skeleton
B) opercula
C) bony fin rays
D) a spiral valve intestine
E) a swim bladder


theo

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Reply #1 on: Aug 10, 2013
Answer has to be A, 100% :D


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vinney12

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Reply #2 on: Sep 9, 2014
Thank you!


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