Explain why the event in the picture takes place

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

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

What are the 4 phases of matter in order of increasing engery content?