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

[Q]: Ice masses, acquifers, and the deep ocean are examples of water reservoirs.
[A]: Ice masses, acquifers, and the deep ocean are examples of water what?


[Q]: Electron transport is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp.
[A]: What is the final stage of aerobic respiration, when energy from the krebs cycle is transferred to atp?


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