Yep. Variation in a population, some that allow them to more successfully have more offspring, which tend to have the characteristics that helped their parents do better. The disproportionate reproduction acts to solidify the beneficial variations and use them as the basis for the next round. Sexual reproduction allows characteristics from different successful offspring to combine.
The origin of life is a different matter. There being evolution doesn't rule out DNA from other planets, life having come from there, other factors as well that shaped us.
Yep. Variation in a population, some that allow them to more successfully have more offspring, which tend to have the characteristics that helped their parents do better. The disproportionate reproduction acts to solidify the beneficial variations and use them as the basis for the next round. Sexual reproduction allows characteristics from different successful offspring to combine.
The origin of life is a different matter. There being evolution doesn't rule out DNA from other planets, life having come from there, other factors as well that shaped us.