Biology
Biology, 07.10.2020 23:01, mary9590

Select the correct answer from each drop-down menu. The heart is a muscular organ that pumps blood. Blood that contains waste materials is brought to the heart by blood vessels. This blood enters the and then moves down. The presence of the prevents the backflow of blood inside the heart

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Select the correct answer from each drop-down menu. The heart is a muscular organ that pumps blood....

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