Answer:
They have a three-chambered heart – two atria and one partially divided ventricle. There is a mixing of oxygenated and DE-oxygenated blood because the ventricle is not split completely.
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Answer:
They have a three-chambered heart – two atria and one partially divided ventricle. There is a mixing of oxygenated and DE-oxygenated blood because the ventricle is not split completely.