Track event where runners pass a baton to the next team member, in a race to cross the finish line first

Boo-___ (crying sound)3 ___ over heels4 Prefix with "present" or "potent"4 Gotten too big for, as one's childhood clothes8 Airport screening agency: Abbr.3 Squirrel's bushy part4 Short-distance track event where runners dash at full speed, in a race to cross the finish line first6 Beast of burden3