Bones of the skeleton are the primary of the skeletal system. two types of bone tissue are present in most of the bones in the body: compact bone and spongy bone. the bone tissue that appears white, smooth, and solid is bone whereas, bone appears porous.

Bones of the skeleton are the primary component of the skeletal system. Two types of bone tissue are present in most of the bones in the body: compact bone and spongy bone. The bone tissue that appears white, smooth, and solid is compact bone whereas, spongy bone appears porous.

Explanation:

The second blank space does not need to be filled in, since the correct sentence is: Two types of bone tissue are present in most of the bones. OR you can say: Two primary types of bone tissue. IF is mandatory to fill the blank, you can put PRIMARY.

Other name for spongy bone is Cancellous bone.

condensation. good luck!