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process whereby excess amino acids are broken down in the liver to form urea.
a watery fluid in which organelles are suspended.
the factor that changes in an investigation and is not under the control of the investigator....
a biological membrane that separates the interior of all cells from the outside environment.
single-celled algae that have two flagella and are found mainly in seawater but are also common...
blood vessel that supplies the heart muscle with blood.