Which of the following groups of animals includes the first vertebrates to appear on Earth?

0 votes
    the jawless fishes
    the cartilaginous fishes
    the bony fishes
    the cephalopods
    none of the above

asked May 30, 2013 in Biology by anonymous
    

1 Answer

0 votes
the jawless fishes
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)



...