Which substance yields h+(aq)as the only positive ion in an aqueous solution

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

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

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.