El nitrógeno en el aire se descompone y se pone a disposición de las plantas mediante un proceso llamado

Ibelieve y y even though i've only taken chemistry for one year

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Idon't know hope someone you