Can some one help me anwser this question?

Evolution may help explain the diversity and complexity of life, yet in no way does it take away its wonder. The multitude of factors necessary for creating and sustaining life are available in this planet in precisely the right concentrations and conditions. Why is this planet so adapted to the life upon it, or vice versa? What is the likelihood, in your opinion, that other forms of intelligent life exist in other forms on other planets? How does an unlikely event, such as the introduction of life onto the Earth, become likely after eons of time?