Edit: as 
This is an answer to 
's recent question, as submitted at https://www.stemq.io.
Nature
The main problem with your original question is a complete misunderstanding of the term "nature".
Nature has no concience and hence cannot choose. Random stuff happens according to natural laws, but there is no governance, no conscious selection. Thus, nature did not "choose" life to happen, but life evolved despite of the existence of entropy.
CC0, pixabay
How can life beat a law of thermodynamics?
It simply doesn't.
Entropy, just as you said, describes "the tendency of the universe [to strive towards] a more chaotic state", but that sencence is half-correct. The second law of thermodynamics doesn't use the term "universe", but describes that "in a closed system", disorder (=entropy) always increases.
The universe might be a closed system for all we know, but a planet - as mother Earth - is clearly not. We get loads of energy from the sun, and by using this energy, life could evolve to ever more complex organisms. With energy input from outside, the laws of physics allow entropy to decrease - locally and for some time.
"Existing forever"
Life will not exist forever. Nothing will. But for the time being, at planet Earth, it does exist. And why would that be a contradiction to nature as we know it?
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