What do these two changes have in common?
water evaporating from a puddle
burning a piece of wood

 - Both are chemical changes.
 - Both are only physical changes.
 - Both are caused by heating.
 - Both are caused by cooling.
Step 1: Think about each change.
Water evaporating from a puddle is a change of state. So, it is a physical change. The liquid changes into a gas, but a different type of matter is not formed.
Burning a piece of wood is a chemical change. When the wood burns, the type of matter in it changes. The wood turns black and gives off smoke.
Step 2: Look at each answer choice.
Both are only physical changes.
Water evaporating is a physical change. But burning wood does not.
Both are chemical changes.
Burning a piece of wood is a chemical change. But water evaporating from a puddle is not.
Both are caused by heating.
Both changes are caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.