Fill in the response. 
[1]. What does the chin have to do with Bajadasaurus?.
[2]. The front of the dentary had a hook-like "chin" projecting downwards, as seen in other flagellicaudatans..
[1]. Is there anything else interesting about the chin?.
[2]. The angular bone of the hind part of the lower jaw was very elongated and longer than the surangular bone, unlike in diplodocids..
[1]. What are the angular bones?.
[2]. Both —small, triangular bones located between the first neck vertebra and the skull—were found in articulation with the skull..
[1]. What is the first neck vertebra?.
[2]. Of the first neck vertebra, the , only the upper elements, the , are preserved..
[1]. What are the elements that are preserved?.
[2]. These were triangular and wing-like in "Bajadasaurus"..
[1]. Is there anything else interesting about the chin?.
[2]. 
The second neck vertebra, the , is nearly complete.