There is no one answer as to how "life" arrived in the universe. There are many ways to define "life".
When a star ends it's "life", it spews out the elementary particles necessary for intelligent life to begin on planets one day. Therefore, this 'cycle of evolution' (also called God, to some); the constant changing which leads to unpredictably complex organisms who display intelligence, and one day, consciousness, can itself be called life.
Therefore, long story short, life is a naturally occurring event in this universe, given each of the elements on our periodic table's specific properties allow them to react to each other in near infinite variety.
So, there is no one answer as to how "life" arrived in our universe. To paraphrase Dr. Ian Malcolm from Jurassic Park: In this universe, 'life finds a way.'
However, there may yet, one day, be enough evidence to quantify a probability factor of how life specifically arrived on our planet. Until then, it is pure speculation. (The God hypothesis, as described by most religions today, has a probability of near zero.)