I would love to help but I’m afraid that there’s a book that is behind this and I haven’t read it so I wouldn’t know how to answer these questions.
        
             
        
        
        
The answer would be : to show the audience that he knows about many uses for herbs.
Hope this helps !
Photon
        
                    
             
        
        
        
Answer:
Students whose grades are low can sit for the exam again.
Explanation:
We use whose to introduce the relative clause when we are referring to people or things. In this case, the relative clause talks about grades, which is a thing that is why we use whose. We can replace whose with the possessive pronoun their. 
In a sentence, the relative clause functions as an adjective because it is modifying the noun just like an adjective does. In this sentence, the relative clause -whose grades are low- is affecting the noun students.
 
        
             
        
        
        
The thesis, or the statement that unifies all of the content in a work of literature.