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.
Spongy bone tissue lacks Haversian canals, which are found in compact bone tissue. These canals are responsible for carrying blood vessels and nerves through the bone. Spongy bone also lacks a dense arrangement of bone cells, giving it a more porous and lightweight structure.
One disadvantage of compact bone is that it is dense and heavy, making it more prone to fractures under excessive force or impact. Additionally, its lack of porosity may limit its ability to store essential minerals and blood cells compared to spongy bone.
Cacti lack a spongy layer in their stems because they have adapted to hot, dry environments with limited water availability. The absence of a spongy layer reduces the surface area for water loss through transpiration, helping cacti conserve water and survive in arid conditions.
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.
Everything except bone.
lack of calcium
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