VoiceAge also accepts submission of patents for determination of their possible essentiality to these standards. Includes predicted gene essentiality and data compilation from published single-gene essentiality studies. There is also a major debate about the essentiality of a constitutive object. Essentiality can be explained by referencing necessity and/or possible worlds. More specifically, there is continued debate about the essentiality of objectivity in anthropological fieldwork. The essentiality of chromium has been challenged. Casalino described the song as an Italian-style ballad that is about the necessity of essentiality. The "Improver" Questions continue to be relevant for the analysis of essentiality under Canadian law. ATA advocates the essentiality of the trucking industry in the U.S. economy. It was accompanied by a certificate of essentiality, issued by the Electricity Commissioners.