Heart is devoid of

During respiration, the gases enter into the blood and leave the same by the process of

Green glands are associated with

The total population divided by available arable land area is referred to as

A form of condensation that reduces visibility and causes breathing problems is

Consider the following pairs;

Tributary Main Piver 
1. Chambal Yamuna 
2. Sone Narmada 
3. Manas Brahmputra

Which one of the pairs given above is/are correctly matched?