How were the creatures actually 'evolved' or even 'born' in the first place? What biological rules were enforced over their development? How did they learn to

How were the creatures actually 'evolved' or even 'born' in the first place? What biological rules were enforced over their development? How did they learn to overcome obstacles and opponents? This is very interesting, and especially intriguing since this is a 1994 video and I haven't seen any modern examples of this, which would be equally interesting.