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Once found almost entirely
in the western United States and in Asia, dinosaur fossils are now being
discovered on all seven continents. A host of new revelations emerged in 1998
that promise to reshape scientists ’ views of dinosaurs, including what they
looked like and when and where they lived.
It is doubtful that
Tyrannosaurus Rex had lips or that Triceratops had cheeks, says Lawrence Witmer,
an assistant professor of anatomy at Ohio University in Athens, Ohio. Witmer was
a leading researcher for a study on dinosaur anatomy that was presented at the
annual meeting of the Society for Vertebrate Paleontology, which concluded on
October 3 in Snowbird, Utah.
Witmer’s study reached its
conclusions by using high-tech computerized axial to mograply (CT or CAT) scans
along with comparative anatomy studies. For example, the theory that Triecratops
and similar dinosaur species had cheeks was based on past comp
A. Tyrannosaurus Rex had lips and Triceratops had cheeks
B. dinosaurs might have looked like mammals such as sheep
C. dinosaurs might not have looked like what we thought
D. dinosaurs must have looked like birds or crocodiles