Bone marrow plays an important role in our circulatory system because Bone marrow contains hematopoietic stem cells which is the major producer of red blood cells or erythrocytes,white blood cells also know as leukocytes and also platelets( thrombocytes) which is the major components of our blood,the only liquid that is very essential in our circulatory system.
There are two kinds of food chains one starting with autotrophs, the grazing food chain, and the other starting with dead organic matter, the detrital food chain.
