What do bone marrow and dermis have in common?

Both bone marrow and dermis are composed of connective tissue. Connective tissue is a type of tissue that connects, supports, and protects other tissues and organs in the body. It is made up of cells, fibers, and a ground substance. The cells in connective tissue include fibroblasts, macrophages, and mast cells. The fibers in connective tissue include collagen, elastin, and reticular fibers. The ground substance is a gel-like material that fills the spaces between the cells and fibers.

Bone marrow is a specialized type of connective tissue that is found in the cavities of bones. It is responsible for producing blood cells. The dermis is a layer of connective tissue that is found beneath the epidermis (the outermost layer of skin). It is responsible for providing support and structure to the skin.