why does spongy bone lack osteonic canal
Spongy bone has holes in it that make it strong, but compact bone doesn't have any holes in it.
osteons
my brain can not answer that quest
They become brittle because the interior spongy bone which is responsible for bone density deteriorates and what is left is mostly compact bone which is brittle and likely to break or shatter easily.
Scurvy is caused by a lack of vitamin C in the body, symptoms typically include lethargy, spongy gums, bleeding from mucous membranes and spots mainly on the legs and thighs. Rickets is caused by a lack of vitamin D, calcium, phosphorus or magnesium in the bones of children. This causes bone softening leading to fractures and deformity.
lack of calcium
Everything except bone.
No , Protozoa lack back bone .
lack of canal system
lack of canal system
Beetles are invertebrates as they lack back bone .
osteoporosis--lack of calcium rickets--lack of vitamin D, calcium or phosphate