Thank you, Alan, for your challenge to my statements. I do not mean that the Essay Question is 'bad' -- I'm just trying to put it into perspective.
And, don't we all use Models to help us understand 'How Things Work?" I certanly do. My point is not to diminish the 'Model' but to remind us that it is 'Just That' - an explanation that Works. Does that mean it is 'Real?'...
For example, I believe that 'Fractals' do mathematically describe several of the interesting structures found in nature. But when I attended the Nobel Conference on "Chaos, the New Science" in St. Peter, MN, The Mathematician said (strongly!) "Where's The Proof!!" The Fractals help us to understand what 'Nature' is doing. The 'Proof' remains to be demonstrated.
Mike