hunted by humans/last ice age
The extinction of so many organisms left a large ecological niche to expand into, which mammals did.
The evolution of mammals
The primary hypothesis is that they were led to extinction by hunting by humans.
the extinction of most dinosours
Extinction events, such as the Permian extinction and the KT extinction event. You have adaptive radiation driving evolutionary change after such events. Google " the rise of the mammals. "
Arthropods, they make up about 75% of all described life and have more than 900,000 members.
During the KT extinction event the majority of life on earth became extinct. Small mammals, however, were able to survive this mass extinction.
Triaddic :)
The Cretaceous period ended with the extinction of the dinosaurs. The period that followed the mass extinction was called the Paleocene. This was a time of the mammals.
Extinction events, such as the Permian extinction and the KT extinction event. You have adaptive radiation driving evolutionary change after such events. Google " the rise of the mammals. "
The extinction of the dinosaurs is one of the many events that allowed humans to evolve. After the dinosaurs died out, mammals began to occupy the world they left behind. Mammals grew and diversified, spreading throughout the Earth, and eventually giving rise to humans.
the extinction of dinosaurs created an opportunity for mammals. Another thing that created an opportunity for mammals in the Cenozoic Era was the fact that they evolved so quickly because they had no limiting factors.