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

[Q]: You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors.
[A]: What do you call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission?


[Q]: Saturated hydrocarbons hydrocarbons contain only single bonds between carbon atoms.
[A]: What hydrocarbons contain only single bonds between carbon atoms?


[Q]: The heterotroph eats only or mainly plants.
[A]:
The heterotroph eats only or mainly what?