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Blaise Durgan ∙
An electrocardiogram is a graphical recording of the cardiac cycle produced by an electrocardiograph monitoring heart beats.
antibody
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.
The range is the difference between the greatest and least numbers.
If you quote a concentration 'x' as so many parts per hundred, then that number does represent hundredths. It's just a fraction, x/100
Volcanos and hot geysers do show that heat is coming from inside the earth.
ecology
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What is one thousandth