When a plant grows , the size of the leaves of that plant may increase.
All oaks are plants.
When an oak grows , the size of the leaves of that oak may increase.
What can happen to an oak's leaves when the oak grows?
  they increase in size
  Localized damage
  Earth revolving around the sun
  they decrease in size
  Exfoliation
  The bending of a ray of light
  they catch fire
  they float into space