500
                                Improve this short response and explain what you changed:  
The author has a purpose.  For example, "People do not know that dolphins are endangered."  Also, "If more people knew, we could protect these animals."  These quotes show that the author has a purpose.  
                                What is: 
The author's purpose is to move the reader to help dolphins.  For example, he states that "People do not know that dolphins are endangered."  However, he says that "If more people know, we can protect these animals."  In other words, the author's goal is to inspire us to take action and help save this at-risk species.  
(Stronger claim, stronger explanation)