joints
that is called the baby's soft spot. which is when the baby's skull is not fully developed.
Spaces between skull bones that have not ossified usually occur from birth to age two and are called fontanels. By age two, the fontanels close and become sutures.
The answer is bones. Bones are filled with marrow and have air spaces to make them lighter in weight.
sinuses
No. Its called a skull.
The type of bone that contains air spaces is called spongy or cancellous bone. This type of bone is less dense than compact bone and is characterized by a mesh-like structure that provides support while making bones lighter. Spongy bone is primarily found at the ends of long bones and in the interior of flat bones.
Birds.
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they have no bones
they have no bones
The Spaces in Between was created in 2007.
the bones are filled with bone marrow