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all the chemical processes that take place in cells.
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...
the main force responsible for the upwards movement of water in the xylem.
extremely small infectious particles that can only reproduce inside a host cell.
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...
the process whereby certain substances are removed from a liquid and others retained, due to...