During chordate evolution,what is the sequence (from earliest to most recent)in which the following structures arose?
1)amniotic egg
2)paired fins
3)jaws
4)swim bladder
5)four-chambered heart
A)2, 3, 4, 1, 5
B)3, 2, 4, 1, 5
C)3, 2, 1, 4, 5
D)2, 1, 4, 3, 5
E)2, 4, 3, 1, 5