In "When Is a Planet Not a Planet?" why does the author say that the outer planets are made of gas when the inner planets are made of rock and dirt? A. All the gas from the inner planets floated to the outer planets. B. The outer planets did not experience the force of the sun that blasted the gas from the inner planets. C. The outer planets remained gas because they were bigger. D. The outer planets were generally hotter, so they remained made out of gas.

Suppose you are an ad-serving company and you maintain a log of cookie data for ads you serve to the web pages for a particular vendor (say amazon). a. how can you use this data to determine which are the best ads? b. how can you use this data to determine which are the best ad formats? c. how could you records of past ads and ad clicks to determine which ads to send to a given ip address? d. how could you use this data to determine how well the technique you used in your answer to part c was working? e. how could you use this data to determine that a given ip address is used by more than one person? f. how does having this data give you a competitive advantage vis-à-vis other ad-serving companies?