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

Seismologists originally measured the intensity of an earthquake with the mercalli scale.
How did seismologists originally measure the intensity of an earthquake?

Interstitial fluid are all hormones secreted into before entering the circulatory system.
Where are all hormones secreted into before entering the circulatory system?

Glucose molecules molecules in the body holds energy.

Which molecules in the body holds energy?