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The upper chambers of the heart are the
The useful part of Zingiber officinale is _?
The vaccination against small pox involves the introduction of
The vegetation of the Thar desert consists of
The virus is
The virus of AIDS affects the growth of __
The virus that infects a bacterium is
The vitamin necessary for coagulation of blood is:
The vitamin that helps in blood clotting is
The vitamin that helps to prevent infections in the human body is