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special chemical molecules that transmit nerve impulses across a synapse.
the main blood vessel that returns deoxygenated blood from the head and thorax to the right...
tough cartilage that acts as a shock absorber between vertebrae and at the ends of bones in ball...
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...