I can't answer that, are you talking about Federick Douglass and the book he made about his life?
Intervene means when one get involved in sth or situation just to alter or change results of an action
I maybe would be able to help you if I could see it !
F.Why and I would also say D what. For example if you would predict that a pig is pink for example. What: I predict pigs are pink. Why: here you would have a reason.
Answer: had effects on other parts of the food web
Explanation: