Question

which of these led to the age of mammals? inbreeding of dinosaurs caused by a declining population adaptive radiation after the mass extinction of the dinosaurs selective breeding done by humans hoping for better species

Explanation:

The extinction of dinosaurs removed major competitors, allowing mammals to undergo adaptive - radiation and diversify, leading to the Age of Mammals. Humans did not exist during the transition to the Age of Mammals, and dinosaur in - breeding was not the cause of the Age of Mammals.

Answer:

B. adaptive radiation after the mass extinction of the dinosaurs