Limnetic, profundel, littoral, and benefitic have what in common

Which statement justifies that phosphine (ph3) is a polar molecule?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Many pharmaceutical drugs are organic compounds that were originally synthesized in the laboratory. which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology