You are presented with the question "Most types of what have motility?" and the following answer choices: 
- gastropod shells
 - members of their own species
 - single-celled organisms
 - Something to move
 - remains of prehistoric life
 - microbial fuel cells
 - microorganisms
 - share properties

Now knowing that most protists have motility and protists Protists are single-celled organisms, choose the best answer.


 

   single-celled organisms      