(B) The correct answer is $B$. The skin of a frog is thin,moist,and highly vascular due to the secretion of mucus. This allows the frog to perform cut

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(B) The correct answer is $B$. The skin of a frog is thin,moist,and highly vascular due to the secretion of mucus. This allows the frog to perform cutaneous respiration,where gas exchange occurs directly through the skin,especially when the animal is underwater or hibernating.