processual entity life cycle http://purl.obolibrary.org/obo/UBERON_0000104 An entire span of an organism's life, commencing with the zygote stage and ending in the death of the organism. An integrative interaction network process of an organism that starts from the moment when the first cell forms, has its blueprint stored in the genotype, and performs its dynamic process by interacting with its environment to achieve its survival and other motivations. life life cycles