What do these two changes have in common?
getting a haircut
shaking up salad dressing

 - Both are caused by heating.
 - Both are only physical changes.
 - Both are chemical changes.
 - Both are caused by cooling.
Step 1: Think about each change.
Getting a haircut is a physical change. Your hair is shorter after a haircut. But it is still made of the same type of matter.
Shaking up salad dressing is a physical change. The different parts mix together, but they are still made of the same type of matter.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are physical changes. No new matter is created.
Both are chemical changes.
Both changes are physical changes. They are not chemical changes.
Both are caused by heating.
Neither change is caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.