If a tree falls then sunlight becomes available to the surrounding plants.
All oaks are trees.
If an oak falls then sunlight becomes available to the surrounding plants.
How can sunlight get to plants surrounding an oak?
Options:
  the oak can get wider
  at or near the margins
  the oak can fall
  the oak can stay in place
  competing for resources
  hydrogen and oxygen
  the oak can get taller
  by indirect light