Which of these photos demonstrates a change from heating or cooling that cannot be reversed?

Becky says some changes caused by heating cannot be reversed. Maddy says all changes can be reversed. Their mother cooked hashbrowns for breakfast. Using this example, which sister is correct, Becky or Maddy, and why?

Which of these photos demonstrates a change from heating or cooling that cannot be reversed?

The photo below is an example of a change that cannot be reversed.

Today is the 4th of July, and Sammie's dad celebrated with fireworks. He lit them in the yard for everyone to see. His dad asks them if the changes made to the fireworks can be reversed or not. Sammie says the changes cannot be reversed, and his dad says the changes can be reversed. Using this example, which is correct, Sammie, or his father, and why?

The photo below is an example of a change that cannot be reversed.

Today Patrick and Annie's mother made French toast for breakfast. She asks them if the changes to the bread can be reversed or not. Annie says the changes cannot be reversed, and Patrick says the changes can be reversed. Using this example, who is correct, Annie or Patrick, and why?

The photo below is an example of a heating or cooling change that cannot be reversed.

Which answer choice is a change caused by heating or cooling?

Some changes caused by heating and cooling cannot be reversed.