1. Heart is divided into _______ chambers.   Hint First letter clue   2. _______ are the organs of hearing.   First letter clue   3. Oral cavity remains moist due to presence of a fluid known as _______.   First letter clue   4. There are total _______ premolars in an adult human being.   First letter clue   5. _______ is also known as 'voice box'.   First letter clue   6. _______ is the organ of smell.   First letter clue   7. _______ are the main respiratory organs.   First letter clue   Skip to Diagrammatic repr... ⇒