D Question 9 2 pts What are the 2 reasons as to why it is often difficult to prove that a disease or condition resulted from workplace exposure. D Question 8 List 2 of the 4 well-documented lung conditions that are related to occupational exposure. 2 pts . Question 7 There are 3 parts to the Model for Unintentional Injuries. List the 3 parts. What is the "injury- producing" agent in the model? Choose one of the parts and give an example of the injury producing agent. 5 pts