Answer:
Oxygen-poor blood returns from the body to the heart through the superior vena cava (SVC) and inferior vena cava (IVC), the two main veins that bring blood back to the heart. The oxygen-poor blood enters the right atrium (RA), or the right upper chamber of the heart.
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The answer is B.a social policy under which government does not interfere with conditions in a society or with social change.
The amniotic sac is pair of membranes, which hold a developing embryo (and later fetus) until shortly before birth.
The outermost layer of the amniotic sac is the chorion. Correct answer: C
The chorion contains the amnion and is part of the placenta. The amnion on the other hand is the inner layer which contains the amniotic fluid and the fetus.
Answer: the cardiovascular system
Explanation: