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

Ex Input:
Single-celled organisms and multicellular organisms have this in common: both have a way to get rid of waste materials.

Ex Output:
Which characteristic do single-celled organisms and multicellular organisms have in common?


Ex Input:
Compounds with metals and nonmetals sharing electrons are known as ions kinds of compounds.

Ex Output:
Compounds with metals and nonmetals sharing electrons are known as what kinds of compounds?


Ex Input:
The force of attraction between a positively charged metal ion and the valence electrons it shares with other ions of the metal is called a(n) metallic bond.

Ex Output:

The force of attraction between a positively charged metal ion and the valence electrons it shares with other ions of the metal is called?