The nuclide Rn-204 is the daughter nuclide resulting from the α decay of what parent nuclide?
A) Po-200
B) Th-206
C) Hg-297
D) Ra-208
E) ^4He

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

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

What is the percent by mass of oxygen in fe2o3