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

[Q]: Sucrose is formed when a monomer of glucose and a monomer of fructose are joined in a dehydration reaction to form a glycosidic bond.
[A]: What is formed when a monomer of glucose and a monomer of fructose are joined in a dehydration reaction to form a glycosidic bond?


[Q]: Compression zones is the opposite of rarefaction zones, where air molecules in waves are loosely packed.
[A]: What is the opposite of rarefaction zones, where air molecules in waves are loosely packed?


[Q]: Tissues of marine bony fishes gain excess salts from their surroundings.
[A]:
Tissues of marine bony fishes gain what from their surroundings?