Which is the most dense substance in the list a. aluminium b. lead c. oxygen d. water

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

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-