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the liquid found in the pleural cavity that acts as a lubricant.
molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin...
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...