type of vascular tissue use of photosynthesis presence of cell walls production of oxygen
I gave my students this multiple choice question: Which of the following characteristics is used when classifying organisms within the plant kingdom?

Only one answer is correct among these 4 choices:
- type of vascular tissue
- use of photosynthesis
- presence of cell walls
- production of oxygen

Could you tell me which one is correct?

type of vascular tissue