The development of life from non-life and stresses a purely naturalistic "descent with modification". That is, complex creatures evolve from more simplistic ancestors naturally over time. In a nutshell, as random as genetic mutations occur within an organism´s genetic code, the beneficial mutations are preserved because they aid survival, a process known as "natural selection". These beneficial mutations are passed on to the next generation. Over time, beneficial mutations accumulate and the result is an entirely different organism ( not just a variation of the original, but an entirely different creature.)
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Natural Selection: Process by which populations of organisms with variations that help them survive in their environments live longer, compete better and reproduce more than those who don´t have the variations.