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an organism that helps to spread a disease, but is not infected with the disease.
(also called physical digestion) the breaking down of food into smaller pieces using mechanical...
broad group (taxon) in the biological classification system, which is then divided into kingdoms...
gaps (about 1 micrometre long) that occur between the myelin sheaths generated by consecutive...
the second set of teeth formed in mammals. In humans there are thirty-two permanent teeth.