Which of these provides evidence from developmental blology of a shared evolutionary history?
a. the dna sequences of the cytochrome c genes in chimpanzees and spider monkeys are over 90% identical
b. the skeletal structure of a leg of a horse and a flipper of a whale are very similar
c. both snakes and dogs have pelvical bones even though they are vestigial structures of the snake
d. both lobsters and frogs go through metamorphosis as a process in their life cycle
