Just cosmic accidents, of course. No design. No purpose. Just random collocations of matter+time+chance.
Said no honest man ever.
“The almighty, everywhere-present power of God, whereby, as it were by His hand, He still upholds heaven and earth with all creatures, and so governs them that herbs and grass, rain and drought, fruitful and barren years, meat and drink, health and sickness, riches and poverty, indeed, all things come not by chance, but by His fatherly hand” (Answer to Q:27, “What do you understand about the providence of God?” Heidelberg Catechism).