Universe and life

The universe, they say, started with a big bang.
A single atom hundreds of billions of years ago, blasted to form time, matter, space and various elements that we see now
Life as we know, starts with a single cell, a stem cell, that blasts to forms and transforms into eyes, ears, brain, heart, digestive, reproductive and all other systems.
Humans share almost 98% of their genes with apes and even share their genes with trees. A small variation branches out to a totally different species.
Sounds simple yet so highly complex..
கொஞ்சம் புரிந்தாலும் எதுவுமே புரியவில்லை..