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To be autonomic just means that you're self-fulfilling. It basically means you can take care of your body in the sense that you're eating, drinking, using the restroom, showering, grooming, etc. on your own without the help of someone else; basically just independence. Attachment on the other hand is a strong connection to another person. Both autonomy and attachment develop in adolescence as puberty begins to slow down and you become less and less dependent on the parent to fulfill your daily needs; and instead develop attachment emotionally to them.