What do these two changes have in common?
plants making food from sunlight, air, and water
cooking a pancake

 - Both are only physical changes.
 - Both are chemical changes.
 - Both are caused by heating.
 - Both are caused by cooling.
Step 1: Think about each change.
Plants making food is a chemical change. Plants use energy from sunlight to change air and water into food. The food is sugar. Sugar is a different type of matter than air or water.
Cooking a pancake is a chemical change. Pancakes are made from pancake batter. A cooked pancake is a different type of matter than pancake batter. Pancake batter is wet and slippery. Cooked pancakes are fluffy and can be good to eat!
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are chemical changes. They are not physical changes.
Both are chemical changes.
Both changes are chemical changes. The type of matter before and after each change is different.
Both are caused by heating.
Cooking is caused by heating. But plants making food is not.
Both are caused by cooling.
Neither change is caused by cooling.