Fill in the coefficients that will balance the following reaction: NaC2H302 +
Fe2O₃
Fe(C2H302)3 +
Na2O

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

Nonmetal halogen family atmoic mass 35

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?