Which of these compounds are molecular?
CBr4
FeS
P4O6
PbF2

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

Which best describes how johannes kepler developed his laws of planetary motion

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )