Botany - Animal Kingdom Question with Solution | TestHub

RBCs are formed in the red bone marrow in adults. RBCs are devoid of the nucleus in most of the mammals and are biconcave in shape. They have a red-colored, iron-containing complex protein called hemoglobin, hence the color and name of these cells. The circulatory system of a frog is closed and is nucleated (unlike the enucleated mammalian RBCs), elliptical-shaped, and capable of division.