Here's a problem to solve: Which characteristic do single-celled organisms and multicellular organisms have in common?

Among the 4 following options, which is the correct answer?

- A: Both have cells with specialized functions for each life process.
 
- B: Both perform all life processes within one cell.
 
- C: Both have a way to get rid of waste materials.
 
- D: Both are able to make food from sunlight.
 