What is the body's first line of defense against bacteria and viruses? saliva, mucus, and hairs antibodies lymphocytes lymph nodes

Well your skin is the first line of defense

Rn in the right answer

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