The existence of God has been debated throughout time.

The existence of the rule of law in China has been widely debated.

He felt sure that the existence of these materials and what to do about them had been debated at the highest levels of the government.

But the existence of a causal relationship is still debated.

However the very existence of these rulers is debated.

The existence of current free double layer is still debated among plasma physicists.

The existence of a peace dividend in real economies is still debated, but some research points to its reality.

The existence of a daughter has been debated by historians and genealogists.

At the same time, the existence of a space race in Asia is still debated.

The nature and existence of a national Scottish historiography has been debated among historians.