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an organism that helps to spread a disease, but is not infected with the disease.
neurons that have two outgrowths coming directly from the cell body.
a clear, colourless, odourless and tasteless liquid that can also occur as a gas (water vapour)...
the main vein that returns deoxygenated blood from the lower parts of the body to the right...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.