Pls help ASAP I DONT have time IT ALSO DETECTS IF ITS RIGHT OR WRONGG

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Is this a single replacement reaction or there is no

Calculate the number of molecules present in 0.750 mol of mgo.