TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: When an atom gains or loses an electron it becames a(n) ion.

SOLUTION: When an atom gains or loses an electron it becames an?

PROBLEM: Resistors connected end to end are said to be in series.

SOLUTION: Resistors connected end to end are said to be in what?

PROBLEM: Amphibians may attract mates with calls or scents.

SOLUTION:
Amphibians may attract mates with what?