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

[EX Q]: In pupa stage of their life cycle do insects begin developing their wings.
[EX A]: In what stage of their life cycle do insects begin developing their wings?

[EX Q]: Tight junction is the term for a watertight seal between two adjacent animal cells.
[EX A]: What is the term for a watertight seal between two adjacent animal cells?

[EX Q]: Electrical force has negative attraction.
[EX A]:
What kind of attraction does electrical force have?