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another word for mouth.
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...
tissue that binds organ components and organs together and supports structures of the body.
the U-shaped part of the nephron tubule situated between the proximal and distal convoluted...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
an infectious disease that can be spread or transmitted from one person to another.