Claims

Dinosaurs went extinct because they lacked genetic variance and malleability; in contrast, furry mammals possessed variance in their phenotypes and were thus able to adapt to the asteroid impact and environmental change, demonstrating why biological variance confers survival advantage.

The koala evolved a specialized digestive system to extract energy from eucalyptus leaves, reducing the diversity and effort required for foraging, which led to reduced selective pressure for complex movement and a correspondingly smaller brain size compared to its evolutionary ancestors.