Did life originate from Ocean?

We have famous Belief or scientific claim or article that says life originated from Ocean. 

There is another saying, 

நிர் இன்றி அமையாது உலகு,

This means that the world cannot exist without water? 

So, how did the first rainfall occur? 

Who or how did the first Adam and eve cell occur or appear or was created? 

How did it the first form of life cells, Form itself and or how was it created? 

What makes a cell?  If we can multiply cell in lab environment can we create a cell then.