RecyclerView, LiveData, Lifecycle dependencies

Question

Hello kind people of the internet.

My name is Paul.

I've started to learn Android development using Kotlin, lately I've been following a couple of tutorials regarding RecyclerView, LiveData and Lifecycle.

At first I honestly forgot to declare the dependencies inside my gradle script. But I have discovered that the functionality actually works as expected.

Can somebody please explain to me this phenomenon:

• is it because Android Studio "saw" my imports and automatically "defined" and downloaded the dependencies ?
• is it because of the compileSdk version?

Here is a sample of my dependencies block from one of my projects

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

Also here is my config

defaultConfig {
        applicationId "com.example.myrecycler"
        minSdk 23
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

Thank you!