Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: The newest, outer layers of secondary xylem are called sapwood.
[EX A]: What are the newest, outer layers of secondary xylem called?

[EX Q]: Articular processes allow for the greatest range of rotation within the vertebral column and facilitate the movement of the head.
[EX A]: What processes allow for the greatest range of rotation within the vertebral column and facilitate the movement of the head?

[EX Q]: Cloning is the only commercial way of reproducing plants such as orchids.
[EX A]:
What is the only commercial way of reproducing plants such as orchids?