Bones have multiple layers to provide strength, resilience, and flexibility. The outer layer, known as the cortical bone, is dense and protects the inner structures, while the inner layer, called trabecular or cancellous bone, is lighter and helps absorb shock. This layered structure allows bones to withstand various forces and stresses while remaining lightweight. Additionally, these layers facilitate the production of blood cells and the storage of minerals.
Why are there so many layers in the atmosphere
Skin,mussels then bones
That would depend on what layers are there, what sbstance composeseach layer, where the layers are geographicaly. So many question, so little idea of what is required
two layers but so have three
there are 2 big ones and 2 little bones. so in total there are 4:)
They have so many teeth so they can eat predators bigger than them and use it also to chew their bones (if they have bones).
Butterflies are arthropods, and so do not have bones; they have an exoskeleton.
So your fingers can do many things
There are so many layers in the integrated circuits. The layers are marked by different colors and are usually overlapping. Every modern electrical device has such integrated circuits.
Peri means around and osteum means bone. So periosteum means the structure that surrounds the bone. This fallows that you have endosteum inside the long bones. Also that you have two layers of periosteum for flat bones of the skull bones and no endosteum there. (This layer acts as barrier between the bone and other tissues that is attached to bones.)
bone marrow compact bone spongy bone
Compact bone & Cartukage