1. Undigested food is excreted out of the body through this opening.   15   8   16   1   Hint Half-n-half Clue   2. Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   16   11   15   1   Half-n-half Clue   3. It is a muscular tube containing semicircular rings of cartilages.   14   13   5   9   Half-n-half Clue   4. Food is mixed with saliva here.   1   2   12   13   Half-n-half Clue   5. Bile is secreted here.   6   16   11   14   Half-n-half Clue   6. These are formed by division of trachea.   3   6   7   15   Half-n-half Clue   7. Bile is stored here.   10   13   16   7   Half-n-half Clue