Thing is, human DNA seems to grow into human babies most of the time, yet at molecular level the environment where it grows is a random, chaotic mess. The rough

Thing is, human DNA seems to grow into human babies most of the time, yet at molecular level the environment where it grows is a random, chaotic mess. The rough physical properties, like temperature, and the general chemicals around are stable, but beyond that things are constantly moving and sloshing around in a very unpredictable way. The idea with the three-body problem is that after some time has passed, we have utterly no idea where the bodies have ended up. Ova don't grow into random jumbles of cells, most of the time they grow into babies. It takes a lot of very specific information to grow into a baby instead of some entirely different arrangement of proteins. So either the environment needs to be feeding some rather specific controlling information that makes most ova grow into normal babies, or the cellular machinery itself has a system which compensates for external disturbances and constrains the design to mostly what the DNA directs it to be. As far as I understand biology, it's mostly the latter case.