Did dark matter kill the dinosaurs? Come find out in this talk where I will talk about the evolution of dark atoms which can be a subcomponent of dark matter. I will use semi-analytic technique of galaxy formation called `merger trees' to explore the morphology of a dark atom galaxy i.e. whether they form a galactic disk or more spheroidal structures. I will also estimate the final mass of `dark stars' and constrain the dark atom parameter space using galaxy mass, microlensing and constraints from ultra-faint dwarfs.