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a drug that speeds up the action of the nervous system.
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
kingdom of multicellular eukaryotic organisms that do not have cell walls, feed...
a muscle, gland or organ capable of responding to a nerve impulse in order to bring about a...