12. You encounter a bottle of liquid. This bottle contains substances that separate upon standing, What category of matter is this bottle of liquid? A. Element
B. Homogenous mixture
C. Compound
D. Heterogeneous mixture

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?