(D) In a frog,the deoxygenated blood from various parts of the body is collected by the venous system and brought to the heart through two large veins

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(D) In a frog,the deoxygenated blood from various parts of the body is collected by the venous system and brought to the heart through two large veins known as the vena cavae (precaval and postcaval). These vessels empty into the sinus venosus,which then leads into the right atrium of the heart.