Resources is **special** folder in unity ([List of special folders][1]). Unity always loads all assets from resources folder.
You can move assets to different folder. Then unity will determine what he needs and will only load those assets.
Use Resources folder for assets that are not by default in your scene, but there might be a case in which you want to put it in the scene. Unity will load them and you can access them via Resources.Load.
[1]: http://wiki.unity3d.com/index.php/Special_Folder_Names_in_your_Assets_Folder
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