The answer to the question is called "homophones". These words have same pronunciation, but different spellings. 
 
        
             
        
        
        
Dialogue can show the reader how the character thinks, interacts with others, communicates, and possibly even where the character is from and/or their educational level.
        
             
        
        
        
As in so many mystery novels, Roger Ackroyd is set in a small, isolated community where everybody knows everybody else. The isolated, close-knit setting 1) suggests that the criminal is someone who everybody knows, and 2) creates a paranoid, suspenseful mood, since the criminal is hiding a big secret from their neighbors. It’s also telling that the owners of the two most “important houses” in town are also the two main victims of the novel.
 
        
             
        
        
        
Answer:
have caused 
Explanation:
A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.