What is the electronegativity and bond polarity like in the "head" vs. the "tail" ends of soap?

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

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

How many atoms are there in 5.70 mol of mg