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

Ex Input:
Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.

Ex Output:
Reptiles are described by what term that means their internal temperature depends on the temperature of their environment?


Ex Input:
Gastro-esophageal sphincter sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach.

Ex Output:
Which sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach?


Ex Input:
The sum of the masses of the atoms in the formula is referred to as molecular mass.

Ex Output:

The sum of the masses of the atoms in the formula is referred to as what?