Which of the following analogies best describes the motion of a nonmotile protist?
A. A boat is moved forward by several oars.

B. A boat is moved forward by a current.

C. A boat is moved forward by a single long oar.

D. A boat is moved forward by a motor.

Question

Which of the following analogies best describes the motion of a nonmotile protist? 
 A. A boat is moved forward by several oars.  
 
 B. A boat is moved forward by a current.  
 
 C. A boat is moved forward by a single long oar.  
 
 D. A boat is moved forward by a motor.

anonymous · Answer

B. A boat is moved forward by a current.

anonymous · Answer

This seems more to be about the definition of "motile" versus "nonmotile."  You can see that three of the choices involve something on the boat that is consuming energy and pushing the boat forward.  That is what is meant by "motile."  Therefore it has to be the choice that is unlike any of the other choices on the list.