What are fossils, and how do they help scientists learn about dinosaurs?, About how long ago did dinosaurs first appear on Earth?, How many dinosaur species have paleontologists identified so far?, Why do scientists believe there may be many more dinosaur species still to discover?, What do scientists think may have caused many dinosaurs to become extinct?, How are Tyrannosaurus rex and Velociraptor connected to modern birds?, What evidence suggests that feathers evolved in dinosaurs before birds appeared?, Why is skeletal form important when scientists study dinosaur evolution?, How did changes in dinosaur size play a role in the evolution of birds?, Do you think it is surprising that some dinosaurs may have evolved into birds? Why or why not?.

Dinosaurs

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