biology help please!!? | Yahoo Answers
Mar 04, 2013 · 7. What traits were derived after jaw bones? a. vertebral column. yes, very early after jaws. b. four-legged locomotion, amniotic eggs and hair. much later only in land vertebrates or quadrupeds. c. four-legged locomotion. much later. d. hair. much later still. 8. The ends of the geologic eras such as the Paleozoic and Mesozoic are marked by. a ...
GET PRICE >>