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