What percentage of birds are socially monogamous?

Which of these theropod dinosaurs had a crest?

A. Describe the studies that concluded that the dinosaurs died abruptly. B. Describe the kinds of physical events that might have occurred when the hypothesized asteroid hit the Earth?

Which of these is not a characteristic of Stegosauria?

What was the name of the ocean between India and Asia as well as Africa and Europe?

What does the variety of large tail clubs and associated spikes on ankylosaurids  suggest?

___________________ became the dominant gymnosperms during Mesozoic.

What is the most distinguishing characteristic of the saurischians?

On what continents are the most dinosaur fossils found? 

What are some evidences for late Cretaceous cooling?