1. Absorption of food occurs here.   15   14   10   11   Hint Half-n-half Clue   2. Food descends from mouth to stomach through this muscular tube.   6   7   9   2   Half-n-half Clue   3. Bile is stored here.   10   1   12   7   Half-n-half Clue   4. It is a muscular tube containing semicircular rings of cartilages.   5   3   8   16   Half-n-half Clue   5. Undigested food is excreted out of the body through this opening.   8   16   13   14   Half-n-half Clue   6. Bile is secreted here.   2   5   11   9   Half-n-half Clue   7. Exchange of gases occurs here.   7   5   11   12   Half-n-half Clue