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

Example Input: When an atom gains or loses an electron it becames a(n) ion.
Example Output: When an atom gains or loses an electron it becames an?

Example Input: Water and humidity is the critical factor for the survival of segmented worms.
Example Output: What is the critical factor for the survival of segmented worms?

Example Input: Structures that protect the coast like barrier islands are called breakwaters.
Example Output:
What are structures that protect the coast like barrier islands called?