Following the K-Pg extinction, mammals became a much bigger player on Earth. Though many factors contributed, the elimination of the terrestrial dinosaurs was almost certainly relevant. Large mammals (such as ourselves) might never have risen to prominence had terrestrial dinosaurs who dominated the competition for essential resources not first been eliminated. One speculation for why dinosaurs fared so much better than mammals before the Chicxulub impact is that dinosaurs laid eggs in volume, whereas mammals have fewer offspring and give birth less frequently the larger they are. Dinosaurs
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