To what element does polonium-208 (atomic number 84 decay when it emits an alpha particle?

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

When would a bouncy ball have the most potential energy

What information does a complete ionic equation give that the balanced equation doesn’t show?