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an almost self-contained ecological unit.
blood that has no antigens (blood group O) and can be given to a person with any blood group....
the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
part of the skeleton consisting of the skull, vertebral column, sternum and ribs.
a serious eating disorder in which sufferers starve themselves voluntarily owing to extreme...