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a muscle, gland or organ capable of responding to a nerve impulse in order to bring about a reaction to stimuli.
those species that are found only in a particular area or region and nowhere else on Earth.
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
small structures found in the jaw that are used for biting and chewing food.
a molecule formed during glycolysis by the breakdown of glucose.
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...