Limnology is related to

Limnology is the study of

Limnology is the study of

A relation in a set A is called ......... relation, if each element of A is related to itself.

Kindle is related to Burn in the same way as Angry is related to

If 'Ground' is related to 'Play' and 'Gym' is related to 'Exercise' in the same way as 'Airport' is related to '_______'.