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a measure of acidity or alkalinity.
symbiosis where one organism lives on another (on the outside of another).
blood that has no antibodies (blood group AB) and can receive any type of blood.
a system of veins which carries blood from the digestive tract to the liver.
an infectious disease caused by the bacterium Mycobacterium tuberculosis thatusually...
when an animal is dormant during hot and dry conditions.