I propose that between chaos and rules there is a third venue, call it guidelines for want of something better. Like HS kids changing classes, chaos but limited by the guidlines(hallway).
I think evolving has guidelines for example;
Species has medium length legs and produces offspring with short, med-short, med-long and long legs.
Short legs = too slow, caught and eaten
long legs = too delicate, breaks, caught and eaten
med-long = OK, escapes
med-short = OK, escapes but not as often as med-long
So short and long are outside the guidelines and are eaten.
med-short and med-long are inside the guidelines and survive.
Logically the med-longs would eventually out last the med-shorts but there are other things that can come into play so both would survive.
As long as they are producing 4 sizes of offspring half will be enough food for predators. The med-shorts could be just fast enough to find shelter the med-longs can't use. The med-longs may taste better. God's will.
If there wasn't the possibility of guidelines we wouldn't have so many critters (especially insects) that are ALMOST alike.
Read chapter 7....quiz next class.
Sorry, got a little involved there.