Addressables loading a prefab

I have a question about loading a prefab using an addressables system.

Let's say I have a car model using different materials, textures, etc.

What happens if the car itself is addressable but the textures, materials, etc, are not? Are they added to memory when the scene is loaded? (just like referencing a prefab directly)

And what happens if they are also addressables, when I load the car prefab do they automatically get loaded too? When I am unloading the car, do they get unloaded too or do I need to unload them as well?