Question

why does compact bone have canaliculi, but spongy bone does not?
spongy bone does not have osteocytes, unlike compact bone.
spongy bone does not require a blood supply.
nutrients and wastes cannot diffuse through spongy bone.
nutrients and wastes cannot diffuse through compact bone.

Explanation:

Canaliculi are small channels that connect osteocytes in compact bone for nutrient - waste exchange. Spongy bone has a more open structure and its osteocytes are closer to blood - filled spaces, so it doesn't need canaliculi for the same function. Spongy bone has osteocytes, requires a blood supply, and nutrients and wastes can diffuse in it. Compact bone needs canaliculi as diffusion directly is difficult due to its dense structure.

Answer:

None of the provided options are correct.