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

[Q]: A decline in blood flow to kidneys organs stimulates release of the enzyme renin, in turn stimulating the reabsorption of sodium and water.
[A]: A decline in blood flow to what organs stimulates release of the enzyme renin, in turn stimulating the reabsorption of sodium and water?


[Q]: The sum of the masses of the atoms in the formula is referred to as molecular mass.
[A]: The sum of the masses of the atoms in the formula is referred to as what?


[Q]: Red-shift refers to a shift toward red in the spectrum from stars.
[A]:
red-shift refers to a shift toward red in the spectrum from what celestial bodies?