DNA and sex.
X and Y is zero and one, diameter and circumference of a circle. This means, automatically, complementarity is the basis for a unit (any unit), because duplicity (duplication) (reproduction) is involved.
Radiation, rotation and revolution, are the three dynamics in the universe that are controlled by (and prove) the conservation of a circle. This gives us weather and time, and, maybe, more important, perpetual reproduction.
Meaning, every spring, we expect nature to ‘begin again’ and, in-the-fall (adequately named) we expect nature to ‘end again,’ and, yes, of course, this is, so, obviously, circular.
So, that means life is very easy to defend. Everything is 50–50. Exactly 50–50.
100–0, and-or 100–1, it is still, by nature, because it’s circular, 50–50.
So, all this takes, to see it, is to step back, a very little, and think about it, from an ‘intelligent’ point of view. Where, intelligence in nature is defined by 50–50, and the complementarity, that’s everywhere, means a circle has control.
Meaning, things repeat, are stable, even though, on some days, (half-of-all-days) the opposite seems true.