cadena

Ive heard different theories and statements that when the asteroid that hit the earth during the time of the dinosaurs that it wiped out all life. Even micro-organisms and bacteria, then also that it didnt wipe out all life, or that when it did destroy all life there was a burst of life later that no one can really explain. So if it did wipe out all life, where did the burst of life come from afterwards, when not even bacteria and micro-organsims lived? how did life begin again after the asteroid that hit earth at terminal velocity?