[metmom]

Any that caused extinction. Ice ages are probably the best known. Life either adapts or dies. It's probably relative, whether the climate change was too fast or the rate of mutation too slow, either way, they are extinct because the life couldn't keep up.

BTW, I was answering your questions- "Ever hear of extinction? Ever hear of mass extinction?" Yes, I had heard of them.

[js1138]

I understand this. What I don't understand is where the problem is. Life is not infinitely plastic, and evolution does not always occur at rates sufficient to prevent extinction.

Evolution is, in effect, a problem solving strategy, a game strategy. It doesn't win every deal.