title: Should I add 'com.google.android.gms:play-services:11.8.0' to build.gradle when I need to use Google in-app?
body: <p>I use Kotlin and Android Studio 3.0, in order to use AdMob Ad, I should add   <code>implementation 'com.google.android.gms:play-services-ads:11.8.0'</code> to build.gradle.</p>
  
  <p>Now I hope to use Google in-app, should Ito add   <code>implementation 'com.google.android.gms:play-services:11.8.0' to build.gradle</code> ?</p>
  
  <p>BTW, does it <code>com.google.android.gms:play-services:11.8.0</code> include all Google services ? and <code>com.google.android.gms:play-services-ads:11.8.0</code> only for AD?</p>