With the CMBR being so low-temp (4K IIRC), combined with the vast distances of empty space (I know it's not really empty, but practically so), the tendency over time is that temperature will settle down to lower and lower energy states, as energy radiates outward. (Because no energy is being added to the system.)
Order requires energy -- i.e. our highly thermodynamic body processes -- so as the temp lowers, disorder will tend to decrease.
Maybe a physicist can correct me, but that seems like a simple yet accurate system-wide summation. Of course, local areas (such as Earth) can retain enough heat for a span of time to maintain complexly organized systems, but in the universe's time scale, it's going to keep winding down towards that CMBR, where ever little complexity will be possible.
Order requires energy -- i.e. our highly thermodynamic body processes -- so as the temp lowers, disorder will tend to decrease.
Maybe a physicist can correct me, but that seems like a simple yet accurate system-wide summation. Of course, local areas (such as Earth) can retain enough heat for a span of time to maintain complexly organized systems, but in the universe's time scale, it's going to keep winding down towards that CMBR, where ever little complexity will be possible.