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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.
compounds that consist of any combination of elements, but do not usually contain carbon and...
reactions in which large complex molecules are broken down to form smaller,simpler molecules;...
specialised heart muscle tissue between the right atrium and right ventricle which conducts the...
a molecule that is formed when oxygen and haemoglobin combine chemically.
tough cartilage that acts as a shock absorber between vertebrae and at the ends of bones in ball...