The red cells are minute disc shaped bodies, concave on either side. They are present in very large amount, numbering about 5 millions in adult male and 4.5 millions in adult female per cubic millimeter of blood.
Red soil is formed due to weathering of igneous and metamorphic rocks whereas the latter is formed by the leaching process in the heavy rainfall areas of tropical India.
The difference between Red Bone Marrow and Yellow Bone Marrow is that the former is a red coloured active haematopoietic tissue in end (epiphysis) of long bones whereas the latter is a yellow coloured inactive haemopoietic tissue in shaft of long bones.