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☆☆☆☆☆An electrocardiogram is a graphical recording of the cardiac cycle produced by an electrocardiograph monitoring heart beats.
antibody
carrier.
the aveoli
Vein
a type of air pollution common around but not limited to cities.
smog
Organisms that once lived on earth but have all died out are extinct.
Volcanos and hot geysers do show that heat is coming from inside the earth.
ecology
The chance that a given event will occur, usually expressed between the number 0 (will not occur) and 1 (will occur) is called probability.
Voice box: The voice box, or larynx, is the portion of the respiratory (breathing) tract containing the vocal cords which produce sound. It is located between the pharynx and the trachea. The larynx, also called the voice box, is a 2-inch-long, tube-shaped organ in the neck
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