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(D) Frogs and humans share several anatomical features,such as the presence of a thyroid gland,parathyroid glands,paired cerebral hemispheres,and a he

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Nucleated red blood cells

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(D) Frogs and humans share several anatomical features,such as the presence of a thyroid gland,parathyroid glands,paired cerebral hemispheres,and a hepatic portal system. However,a key difference lies in the nature of their red blood cells $(RBCs)$. In humans,mature red blood cells are enucleated (lacking a nucleus) to maximize space for hemoglobin. In contrast,frogs possess nucleated red blood cells throughout their life cycle. Therefore,the correct option is $D$.

Column - $I$	Column - $II$
$(A)$ Nictitating membrane	$(1)$ ..........
$(B)$ Tympanum	$(2)$ ..........
$(C)$ Copulatory pad	$(3)$ ..........

Frogs differ from humans in possessing$-$

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Write the functions in brief in column $II$, appropriate to the structures given in column $I$.
Column - $I$ Column - $II$
$(A)$ Nictitating membrane $(1)$ ..........
$(B)$ Tympanum $(2)$ ..........
$(C)$ Copulatory pad $(3)$ ..........

In the kidney of a frog,the cortex and medulla regions are ........

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