1. It secretes saliva.   2   15   3   9   Hint Half-n-half Clue   2. Food descends from mouth to stomach through this muscular tube.   9   6   7   12   Half-n-half Clue   3. It is a muscular tube containing semicircular rings of cartilages.   10   15   5   2   Half-n-half Clue   4. Bile is secreted here.   14   11   2   3   Half-n-half Clue   5. Churning of food occurs here.   12   8   16   7   Half-n-half Clue   6. Most of the ingested water is absorbed here.   15   6   14   1   Half-n-half Clue   7. Exchange of gases occurs here.   10   7   12   16   Half-n-half Clue