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(D) The heart of a frog is myogenic,meaning the heartbeat originates from specialized muscle cells within the heart itself rather than from nervous im

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$III$ and $IV$

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(D) The heart of a frog is myogenic,meaning the heartbeat originates from specialized muscle cells within the heart itself rather than from nervous impulses. Because the heart is myogenic,it is also self-excitable,allowing it to continue beating for a short period even after being removed from the body,provided it is kept in a suitable physiological saline solution. Statement $(i)$ is a fact about frogs but does not explain why the heart continues to beat. Statement $(ii)$ is incorrect as frogs have a closed circulatory system. Therefore,statements $(iii)$ and $(iv)$ are the correct reasons for the observed phenomenon.

Column-$I$	Column-$II$
$(a)$ Tricuspid valve	$(i)$ Between left atrium and left ventricle
$(b)$ Bicuspid valve	$(ii)$ Between right ventricle and pulmonary artery
$(c)$ Semilunar valve	$(iii)$ Between right atrium and right ventricle

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