what is bone marrow
bone marrow is a distinctive class of tissue that fills the cores of larger bones in humans and other animals unlike the hard or compact tissue that forms the outer shells of bones the marrow has a malleable sponge like textureone marrow is a distinctive class of tissue that fills the cores of larger bones in humans and other animals unlike the hard or compact tissue that forms the outer shells of bones the marrow has a malleable sponge like texture