There are reductionist answers to these questions, albeit incomplete. We know about evolution, we know about the Big Bang. We are not sure by what exact mechanism consciousness works -- if we can even define it properly enough to begin with, but going by our current model of the universe we know it is the result of the Big Bang, and evolution.

There are intermediate answers to questions like "Why this life, why is this the one I have? Where did all of this come from? How did all of this happen?"

The chain of intermediate questions and answers leads to the ultimate frontiers of science. One has to accept the possibility that our desire for an ultimate, resounding answer to these questions may never be quenched. Perhaps the universe just defies human understanding at some point. Even our language become circular at some point: the definitions of "thing", "entity", and "object" all refer to each other - there is no definition beyond them; without circularity dictionaries would be infinite.