Explain how the history of biology demonstrates that new knowledge can change established

The history of biology traces the study of the living world from ancient to modern times 

1. Chemical change changes the objects color, shape, form or smell
2.burning something, cooking something and rotting
3. Rusting, I think rusting is a chemical change because the air is rusting a object and the air begins to change the color and shape
4. Because once a chemical change happens it will most of the time happen fast