What's Life

What's life?
What's life according to your understanding?
A lecturer ones wrote "what's life" as he's exam questions
and the students started laughing, telling him that his questions are too cheap but at the end of the day, nobody got the answer.
Why were their answers wrong?
The students gave him two categories of answers. Technical and scientific
But the major aim of the lecturer was to get the real knowledge of life according the the level in which a layman on the street can understand.
I've been searching for the real answer to this very question of life for a while and yet no one has been able to explain it well to me.
For example, a rich man has all it takes to change the world but has no offspring but a poor man that has nothing to offer to the nation has many offsprings.
Why is it so.
Most only sons don't understand who they are while those that are many in a family struggles to get to the top(survival of he fittest).
Life is not just being a being or waking up every morning or doing according to the biological definition. No
There many things attached to life and I have to keep on searching.
Thanks for your time.