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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

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer.