 is one of the key features that sets it apart as biological. Likewise when Julian Huxley later proposed three conditions of what he called minimal organismality, one of these concerned integration of internal functions and a second concerned independence from external forces (Huxley 1912: 28). Like Spencer, Huxley saw these internal and external matters as causally linked within individuals, and as together achieving equilibria in distinctive ways. Huxley thought this was due especially to the parts of biological individuals being both more heterogeneous and functionally integrated with each other than is seen in the non-biological context external to such individuals. Two contemporary cousins of this idea in the literature focused on evolutionary individuals will be the focus of  section 8  below.