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

In circles way do particles of water move in deep water.
In which way do particles of water move in deep water?

The newest, outer layers of secondary xylem are called sapwood.
What are the newest, outer layers of secondary xylem called?

Lymph capillaries structure collect fluid that leaks out from blood capillaries.

What structure collect fluid that leaks out from blood capillaries?