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  1. Your app contains a physics simulation that requires heavy computation to display. Then the user gets a phone call. Which of the following is true?
  2. Which lifecycle method should you override to pause a physics simulation when the app is not on the screen?
  3. To make a class lifecycle-aware through the Android lifecycle library, which interface should the class implement?
  4. Under which circumstances does the onCreate() method in your activity receive a Bundle with data in it (that is, the Bundle is not null)?