>>'change ... advantageous to that organism.
this is probably more correctly natural selection in operation.'
.,,.
But Pete ~~ that is what 'evolution' means.<<

M that is not what I learned in science class.

"Natural selection" is one mechanism by which evolution occurs.

It certainly seems to me that a certain percentage of bugs had resistance to the chemicals and given the lack of food competition once their non-resistant peers died the quickly bread to fill the gap.

I don't agree with pete's implied point that every creature on earth was created with all its potential for change built in. But I have to concede that his evaluation of the ddt resistant insects is correct. On the other hand I think the idea of "devolution" is nonsense. Adaptation to environmental change is adaptation to environmental change, nothing more nothing less.