 This can be accomplished in a variety of ways, such as through the bottleneck caused by the production of new collectives from single individuals, coupled with germ-line segregation (as in the transitions to multicellularity), or by a single member of the collective preventing all other members from reproducing (for example, among eusocial insects), or by single member having primary but not total control over the other constituents (as in the evolution of eukaryotes) (Godfrey-Smith 2009: 123–124).