A) Four chambered heart
B) Internal fertilization
C) Nucleated RBCs
D) Ureotelic mode of excretion
Correct Answer: D
Solution :
Most animals convert toxic ammonia into less toxic urea and excreted it, e.g., adult frog and man. Four-chambered heart is present in human but two-chambered in frog. Nucleated RBCs are found in frog but not in human. Fertilization is internal in human but external in frog.
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