please answer asap thank you

1) Why is it important for any organization to study and understand its external environment? 2) How do the five competitive forces in Porter's model affect the average profitability of an industry? In what way might weak forces increase industry profits and, conversely, in what way do strong forces reduce industry profits? Cite an example of an industry in which many of the competitors seem to be experiencing financial problems. Which of the 5 forces stand out as the strongest and why? 3) Look at the Airbnb case (Chapter case 3). What choice did they make in entering new markets? Discuss how Airbnb might have answered the questions posed in Exhibit 3.6. 4) How do mobility barriers affect the structure of an industry? How do they help us explain differences in a firm's performance