Question

Paleontologists can determine this trait based on the presence of calcium-rich medullary bone in the legs of extinct reptiles. For 10 points each:
[10h] Name this trait, which is also indicated by a baculum. This trait is easily identifiable in Confuciusornis fossils because enough of them remain to allow for population-level study.
ANSWER: sex [accept whether the fossil is male OR female; prompt on gender] (Medullary bone is a source of calcium during egg-laying.)
[10e] Due to their lack of sex-determining features, they/them pronouns are used to refer to Sue, the most complete fossil of this dinosaur. This large, stubby-armed dino preyed on Triceratops during the Cretaceous period.
ANSWER: Tyrannosaurus rex [or T-Rex]
[10m] Male and female dinosaurs can also have differently sized chevron bones, which connect the ventral sides of these bones in the tail. In humans, that group of these bones is fused in the coccyx (“COCK-six”).
ANSWER: vertebrae [prompt on spine or spinal column]
<KT, Biology>

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