Chromium reacts with oxygen gas to form chromium(III) oxide. In the balanced chemical equation for this change, what are the lowest, whole number coefficients? Match the number to the species.

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

Can someone me with questions 15 to 17 plz.

Describe the interaction that occurs between two objects with the same electrical charge.