If these conditions are met, then, by the logic of natural selection, the pattern will evolve towards more adapted forms.

But a week in Boston has been quite long enough for me to see the pattern evolving.

Class 1: Nearly all initial patterns evolve quickly into a stable, homogeneous state.

Class 2: Nearly all initial patterns evolve quickly into stable or oscillating structures.

Class 3: Nearly all initial patterns evolve in a pseudo-random or chaotic manner.

With time, the ethnic pattern did not evolve much.

There were some pretty brutal problems in the early years, but it's easier now that a pattern of behaviour has evolved.

And in those countless generations, certain patterns have evolved.

Before long, a comfortable pattern had evolved to their rounds.

The pattern twisted, evolved, and came to center around one jelly, now glowing more brightly than the rest.