Biology, 27.10.2019 00:43 chloelandry
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
Answers: 2
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The heart is a muscular organ that pumps blood, blood that contains waste materials is brought to th...
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