They are both flexible. They are both stiff. They both make food for a plant. They both give support to a plant.
I gave my students this multiple choice question: What do the long vine of an ivy plant and the trunk of an oak tree have in common?

Only one answer is correct among these 4 choices:
- They are both flexible.
- They are both stiff.
- They both make food for a plant.
- They both give support to a plant.

Could you tell me which one is correct?

They both give support to a plant.