They all hold liquids. They can all be made of glass. They can all be marked in milliliters. They can all be used to measure the volume of a liquid.
I gave my students this multiple choice question: What is the most important thing a cylinder, a measuring cup, and a beaker all have in common?

Only one answer is correct among these 4 choices:
- They all hold liquids.
- They can all be made of glass.
- They can all be marked in milliliters.
- They can all be used to measure the volume of a liquid.

Could you tell me which one is correct?

They can all be used to measure the volume of a liquid.