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a method of ordering the age of different fossils, relative to each other, without working out their actual age.
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...
when the entire heart, both of the atria and ventricles, is relaxed.
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
a system of veins which carries blood from the digestive tract to the liver.
a disease caused by the bacterium Vibriocholera, which produces a toxin in the lining of the...