Given statements explain about formed elements, which option contain correct statements about RBC?

(i) Erythrocytes along with leucocytes and platelets are collectively called formed elements.

(ii) A healthy adult man has, on an average, 5-5.5 millions of RBCs/mm 3 of blood.

(iii) RBCs are formed in the yellow bone narrow in the adults.

(iv) RBCS are devoid of nucleus in most of the mammals and are biconcave in shape.

(v) A healthy individual as 12-16 gms of hemoglobin in every 100 ml of blood.

(vi) RBCs have an average life span of 120 days after which they are destroyed in the spleen (graveyard of RBCs)