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 would be enzyme because vitamin D is a protein enzyme
You should wash your hands efficiently, use hand-sanitizer, Try not to breathe out of your moth you get sick by doing that,try and stay away from other sick people.
