Which statement describes copper? O A. Copper is an insulator because its valence electrons can move freely from atom to atom.
O B. Copper is a conductor because its valence electrons can move freely from atom to atom.
O C. Copper is an insulator because its innermost electrons are shared between atoms.
O D. Copper is a conductor because its innermost electrons are shared between atoms.​

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.