Physicalism needs to show that it is only through the operation of the laws of physics that adaptation can emerge. This chapter attempts to show that physics is necessary and sufficient for all adaptations, and that the only way they can emerge consistently with physics is by natural selection. Darwinism needs to show that the only way adaptations can ever happen even the most trivial and earliest of adaptation is by natural selection working on zero adaptation. It needs to demonstrate that, given the constraints of physics, adaptation could have no other source than natural selection. Physics is sufficient for adaptation by natural selection. The evolution and maintenance of adaptations by natural selection wins the prize for greatest efficiency in carrying out the second law's mandate to create disorder. This is a fact about natural selection insufficiently realized and not widely enough publicized in biology.