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highly addictive substance found in tobacco that accelerates the heart rate, and contracts and hardens the arteries.
a system of veins which carries blood from the digestive tract to the liver.
the very cold zone in an ocean, dam or a lake, located below the range of effective light...
the bone-like substance beneath the enamel of the tooth.
unicellular organisms that do not have a proper nucleus or membrane bound organelles.
the second biological classification group (taxon) that is divided into phyla (for animals) or...