Crocodile

whale

bird

crocodiles, bats, whales, and birds have similar limb bones. what do these similarities suggest?

a.

crocodiles, bats, whales, and birds evolved from a common ancestor.

b. bats and crocodiles share an ancestor with whales but not with birds.

c.

a similar limb structure evolved in each species independently and by chance,

d. the common ancestor of birds and crocodiles was a whale.