TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: In the lungs, oxygen diffuses out of the alveoli and into capillaries.

SOLUTION: In the lungs, oxygen diffuses out of the alveoli and into where?

PROBLEM: The vascular structure functions as a framework that reinforces the shape of the leaf.

SOLUTION: What functions as a framework that reinforces the shape of the leaf?

PROBLEM: The general term peptide refers to an amino acid chain of unspecified length.

SOLUTION:
The general term peptide refers to an amino acid chain of what?