Which two terms out of the 3, relate, and why?
4. atomic mass, compound, isotope
5. electron, ion, neutron
6. atomic number, isotope, radioactive
7. compound, ion, proton
8. energy level, neutron, spectral line

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 be defined as which velocity changes

Which best describes how johannes kepler developed his laws of planetary motion