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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.
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...
a method of ordering the age of different fossils, relative to each other, without working out...
tumours in the lung tissue that interfere with the normal functioning of the lungs.
large blind-ending sac forming the first part of the mammalian large intestine, to which the...
energy resources such as coal and oil, which are being used up much more quickly than they can...