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microscopic canals running longitudinally through compact bone tissue that contain blood vessels, nerves and lymph vessels.
a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A...
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...
informal, local knowledge that has been built up over the centuries by the people who live in a...
is the supply of materials, in the form of food, required by organisms and cells to stay alive...