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It is the sacrum.
the sacrum is located in the back
Annum Sacrum was created in 1899.
the sacrum
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A. Sacrum
B. Pubis
C. Ischium
D. Ilium
Answer A. Sacrum
The Coxal (hip) bones are the Ilium, Ischium, Pubis
The Sacrum is part of the Axial Skeleton.