A scientist discovers a new species and compares its embryos to the embryosOf several different mammals the new organism doesn’t have pharyngeal arches or a notochord and it doesn’t go through the Carnegie stages of development from this information what can the scientists conclude

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   

C, small, hard spheres with insignificant volumes