Final answer:
Bone marrow fills the spaces between trabeculae in spongy bone tissue, which contains red marrow and facilitates the formation of blood cells.
Step-by-step explanation:
The answer to the question "Bone marrow fills the spaces between trabeculae in ______ bone tissue" is A) spongy bone tissue. Unlike compact bone tissue, spongy bone, or cancellous bone, forms the inner layer of all bones and consists of trabeculae which are rods or plates of lamellae where red bone marrow is found. The marrow fills the spaces between the trabeculae, and this structure facilitates the functions of red marrow such as hematopoiesis, which is the formation of blood cells. Spongy bone also contains blood vessels that deliver nutrients to osteocytes and remove waste, thereby maintaining healthy bone tissue.