The study of the origin of diversified life has been plagued by technical and conceptual difficulties, controversy, and apriorism.
Gustavo Caetano-Anollés, Arshan Nasir, Kaiyue Zhou, Derek Caetano-Anollés, Jay E.Mittenthal, Feng-Jie Sun, Kyung Mo Kim 2014, 'Archaea: The First Domain of Diversified Life', Archaeahttp://dx.doi.org/10.1155/2014/590214. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)