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In frogs, blood passes twice through the heart. Hence, they are said to have a
In frogs, blood passes twice through the heart. Hence, they are said to have a
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The correct option is A double
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
In higher vertebrates, blood goes through the heart twice, once to and from the lungs, and the other time to and from other parts of the body. This is called double circulation. In fish, the blood passes through the heart only once and goes to the gills. This is called single circulation.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> In higher vertebrates, blood goes through the heart twice, once to and from the lungs, and the other time to and from other parts of the body. This is called double circulation. In fish, the blood passes through the heart only once and goes to the gills. This is called single circulation.
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