2: The Requirements

We now imagine a biological population that moves through its circulation, which is a complete cycle of the generations. Young are born. They grow, develop, reproduce, and die, leaving a new generation behind. This is the cycle of the departing and the return: the absence from, and presence in, some start location.

We stipulate that the energy and the resources one generation uses for its circulation are completely restored, so that the new generation can then do the same … and on and on indefinitely.

To put this in slightly more formal scientific terms, we are asking:

  1. that a population of biological entities goes through a complete transformation of the generations; and
  2. that the environment it resides in has the identical conditions before and after.

Now we have the requirements for our circulation, we can go on and build the necessary model.