BLOOD IS RED ,because all its cells are packed called with a red-colored substance called hemoglobin.Using this, the red blood cells pickup vital oxygen and deliver it to the body's cells.To achieve this and the other roles, such as removing waste, blood is pumped along blood vessels by the heart. BLOOD COMPOSITION - IF Blood is poured into a glass tube and spun in a centrifuge ,its main components separate into three layers- PLASMA - A watery liquid containing food , waste, harmonies and many other substance. WHITE BLOOD CELLS AND PLATELETS White blood cells fight infection and platelets prevent bleeding by causing blood clots. RED BLOOD CELLS .-These transport oxygen from lungs to tissues. BLOOD VESSELS -There are three types of blood vessels namely- Arteries -it carry oxygen rich blood fro