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

[Q]: You call a substance that is not an acid or a base neutral.
[A]: What do you call a substance that is not an acid or a base?


[Q]: Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.
[A]: Reptiles are described by what term that means their internal temperature depends on the temperature of their environment?


[Q]: Solids are categorized by the forces holding the individual atoms, ions, or molecules together.
[A]:
What is categorized by the forces holding the individual atoms, ions, or molecules together?