height number of leaves type of seeds trunk width
I gave my students this multiple choice question: For his science project, Alan began a study of sugar maple trees. He noticed many differences among the sugar maple trees near his school. Which of the following three characteristics would vary the LEAST?

Only one answer is correct among these 4 choices:
- height
- number of leaves
- type of seeds
- trunk width

Could you tell me which one is correct?

type of seeds