Tracking domains in installed applications

Many websites have tracking domains in their webpages, which I block using "Privacy Badger" Extension by EFF.

These domains are easily visible by pressing Ctrl+U in Firefox to see the "Page Source".

Also I have observed that many apps(which I download from the Google Play Store) show the content which is exactly similar to the content accessed by any web browser on the related web pages. I guess that those apps are nothing more than a web browser in themselves, accessing the related web pages[I MIGHT BE WRONG].

In the above case(or even in the case where content accessed by apps is aesthetically and/or functionally different than that accessed by a browser) I guess that the tracking domains(which are on the related web pages) are also baked into the apps.

My questions:

  1. Are the tracking domains present in the apps also?
  2. Any way to verify their presence[as was the case with Firefox above]?
  3. How to block them from tracking the user[as Privacy Badger does]?

Note: I am just talking about "simple" tracking methods(domains), not "advanced" ones like fingerprinting, Tracking Pixels etc.