1. What is a positive feedback loop? What is a negative feed-back loop? Give an example of each. 2. Explain what a model is. Give an example. 3. Why do we say that proof is elusive in science? 4. What...

1. What is a positive feedback loop? What is a negative feed-back loop? Give an example of each.

2. Explain what a model is. Give an example.

3. Why do we say that proof is elusive in science?