Scientists believe that a major factor promoting the adaptive radiation of mammals was probably
A)their development of fur.
B)the mass extinction of most dinosaurs, an event that opened up new ecological opportunities.
C)internal fertilization.
D)the origin and diversification of flowering plants.

Question

Quizplus · Accepted Answer

The mass extinction of most dinosaurs created ecological opportunities for mammals, allowing them to diversify and occupy newly available niches in the ecosystem. This is believed to have been a major factor in their adaptive radiation.

Scientists Believe That a Major Factor Promoting the Adaptive Radiation