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Go to Settings > System > Developer Options. If you don't see Developer Options, scroll down and select About phone, then look for Build number and tap it seven times. Tap Running Services. It shows the apps currently running on your Android, how much RAM they're consuming, and how long each has been running.
Android protects users from inadvertent downloading and installing apps from locations other than the Google Play store. Even if you wanted to add some Amazon apps, they will be blocked. It blocks these installs until the user opts into/enables Unknown sources in Settings > Security on their device.