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the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal, of the central nervous system.
energy resources such as coal and oil, which are being used up much more quickly than they can...
group of similar organisms that can breed with each other to produce fertile offspring. It is...
single-celled organisms with all life functions performed within the cell.
informal, local knowledge that has been built up over the centuries by the people who live in a...