When was the latest referendum on Quebec's future held in Canada

A．describing how the principles of classical chemistry were developed
B．initiating a debate about the kinds of chemical reaction required for the development of life
C．explaining how current research in chemistry may be related to broader biological concerns
D．clarifying inherent ambiguities in the laws of classical chemistry

A．Molecules of interstellar formaldehyde can evolve into complex organic molecules.
B．Interstellar formaldehyde can be synthesized by tunneling.
C．Cosmic rays can directly synthesize complex organic molecules.
D．The galactic clouds are the places where prebiological evolution of compounds necessary to life occurre