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

[Q]: All life is built around the element carbon.
[A]: What element is all life built around?


[Q]: Glaciers deposit their sediment when they melt.
[A]: When do glaciers deposit their sediment?


[Q]: Prokaryotes are single-celled or colonial organisms that do not have membranebound nuclei.
[A]:
What are single-celled or colonial organisms that do not have membranebound nuclei?