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

Q: The newest, outer layers of secondary xylem are called sapwood.

A: What are the newest, outer layers of secondary xylem called?
****
Q: Humans possess greater diversity of genetics type, compared to laboratory animals.

A: Humans possess greater diversity of what type, compared to laboratory animals?
****
Q: A current is a stream of moving water that flows through the ocean.

A:
What is a stream of moving water that flows through the ocean?
****