If an Asteroid wiped out the Dinosaurs how did Evolution continue?

[Angrboda]

And it's also not true that descendants from the dinosaurs are all extinct, nor that all animals in that clade are extinct. Birds are descended from dinosaurs, and there are many species that are closely related to the dinosaurs who did not die out. A more important effect to look at is how the supposed asteroid impact affected the ecosystem as a whole. While it affected the dinosaurs, it's most significant impact would have been on the plant life of the time, as plants are broadly speaking, sensitive to the parameters which would have been changed by the impact, and can't change their habits or evolve adaptations to the new conditions as readily. I'm not overly knowledgeable about the subject, but it may have been a combination of factors in that both the change in the environment, as well as an inability of the species in that clade to adapt, resulted in the demise of the dinosaurs, in addition to the often overlooked fact that the success of other species can destructively impact the success of competitors. In the ecosystems that resulted from the impact, because the energy from the sun was reduced, the energy available in derivative form in the way of plant material became less available. (The introduction of foreign species into habitats that they are uniquely suited to exploit is a similar phenomena in that the mammals and such would have suddenly become uniquely suited to the changed environment, and the dinosaurs less so; there's a limit to what the resources of an ecosystem can support, and what's a gain for the mammals and other surviving clades, becomes a loss for the dinosaurs.) What might have been an evolutionarily justified adaptation in times of plenty might well become an expensive albatross in times of scarce resources. (There are significant epochs with relation to the evolutionary history of plant life, but I don't know enough about them. http://www.talkorigins.org/ is also a good place to learn about evolution, though it may not be sufficiently basic or topically satisfactory for you.)

(I'll have to watch that video myself.)