Final answer:
The spongy type of bone found at the end of long bones, within the spinal vertebrae, and inside the flat bones of the pelvis is known as spongy bone or cancellous bone.
Step-by-step explanation:
At the end of long bones, inside the spinal vertebrae, and inside the flat bones of the pelvis, the spongy type of bone known as spongy bone or cancellous bone is present. This type of bone is characterized by a mesh-like network of tiny plates called trabeculae, which provide structural strength to the bone. Spongy bone is found primarily in the epiphysis (end) of long bones, within the spinal vertebrae, and inside flat bones, such as those of the pelvis, where it is known as the diploë. Over time, the trabeculae can break down, which causes the bone to become less resilient.