When an egg is exposed to extreme heat, it turns from a liquid substance into a solid substance. Even when the egg is allowed to cool, these changes are not reversible for a number of reasons. Which of the following is not one of these reasons?
1) The proteins in the egg denature and coagulate, permanently changing their structure.
2) The heat causes chemical reactions in the egg, leading to the formation of new compounds.
3) The cooling process causes the egg to undergo physical changes, making it impossible to return to its original state.
4) The extreme heat destroys the cell membranes in the egg, preventing any reversal of the changes.