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the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the respiratory tract during swallowing.
emitting (or giving off) radiation energy, which is harmful to living organisms.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...