1. I’m not sure if the first one :( I’m sorry.
2. No, because After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. Also, Around 66 million years ago, at the end of the Cretaceous period, an asteroid struck the Earth, triggering a mass extinction that killed off the dinosaurs and some 75% of all species. Somehow mammals survived, thrived, and became dominant across the planet.
3. Yes. The extinction of the Passenger Pigeon had two major causes: commercial exploitation of pigeon meat on a massive scale (man-kind killing them) and loss of habitat.