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a chemical substance found in food that is essential for maintaining life.
three pairs of exocrine glands which secrete saliva into the mouth.
all the different living organisms on the Earth from the smallest micro-organisms to the largest...
organic compound that always contains the elements carbon, oxygen and hydrogen. The building...
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...