Which bone is the large, triangular bone at the base of the spine?

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Multiple Choice

Which bone is the large, triangular bone at the base of the spine?

Explanation:
The sacrum is the large, triangular bone at the base of the spine. It’s formed by five fused vertebrae and sits between the two hip bones, forming the posterior part of the pelvis. It connects upward to the last lumbar vertebra and downward to the coccyx, and it helps transmit body weight into the pelvis through the sacroiliac joints. The acetabulum is the hip socket on the pelvis, not a bone at the base of the spine. The femur is the thigh bone extending from hip to knee. The calcaneus is the heel bone in the foot.

The sacrum is the large, triangular bone at the base of the spine. It’s formed by five fused vertebrae and sits between the two hip bones, forming the posterior part of the pelvis. It connects upward to the last lumbar vertebra and downward to the coccyx, and it helps transmit body weight into the pelvis through the sacroiliac joints. The acetabulum is the hip socket on the pelvis, not a bone at the base of the spine. The femur is the thigh bone extending from hip to knee. The calcaneus is the heel bone in the foot.

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