Why does compact bone have canaliculi, but spongey bone does not?
a) spongy bone does not have osteocytes, unlike compact bone.
b) spongy bone does not require a blood supply.
c) nutrients and waste cannot diffuse through spongy bone
d) nutrients and wastes cannot diffuse through compact bone.

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.