well, very nice and interesting topic.

the only one purpose of life is to give birth to life (as per darwin theory).

But then why there should be the chain of lifes is a question to be answered yet by the modern science. Human has evolved and will continue to evolve and make progress. But where's the ultimate end? Human acquired knowledge. Human know how to go to moon. May be in the future there will be dwellings on moon, mars etc. But still did human perceive the whole universe? Where we can say the human has achieved it's highest form / ultimate goal?

But again, even if we found the ultimate goal of human (say living on Mars or travelling by the speed of light) then after that WHAT? What will happen to human race? Will they devolve (de-evolve)? Will the human race become extinct?

The question itself is unfathomable. Forget about answers. Where all our senses (five + one)stop working, shows there limits/boundries, human says I know that "I don't know anything".

But still question fills the mind - Where's the answer?

Go to the mountain,shout loudly;
Go to the desert, run heavily;
Jump into the sea,and swim madly;
Oh creator, reveal to me;
Where is the beginning and where is the end?
When there was beginning what was before the beginning? When there will be the end what will be after end?

Where's the answer?

Well, if i have to write, i can write for a 100s of pages. Let me know your view and i will continue.