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Which of the following is/are unique DIAGNOSTIC CHARACTERISTICS that are used to define animals in suborder Ceratopsidia?
a) Hooked beak on jaw supported by "rostral" bone
b) One or more horns on the face
c) Bony frill at back of skull
d) Long neck with 10+ cervical vertebrae
e) Extra wide cheek bones
f) Diapsid skulls



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