A group doesn't "evolve" overnight. That would be environmental pressures influencing it, not evolutionary. That the groups reverted showed heritability in the

A group doesn't "evolve" overnight. That would be environmental pressures influencing it, not evolutionary. That the groups reverted showed heritability in the face of individual needs. If it were strictly individual needs, the colonies shouldn't have reverted; the evolutionary forces that directed warrior/nanny ratio should have reflected the environment instead of the ancestry of the group.