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an infectious disease that can be spread or transmitted from one person to another.
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...
a v-shaped extension of the mammalian soft palate, which closes the opening to the nasal...
outgrowths of neurons (nerve cells) that transmit nerve impulses towards the cell body.