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all the different ecosystems with their numerous and varied organisms.
the parts and processes of the body that recognise and fight pathogens, such as viruses and...
simple chemical substances needed by the body in relatively small amounts for normal growth and...
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
a rubbery, protein-carbohydrate complex that forms the matrix of cartilage.
the remains of digestion, which are eliminated from the body via the anus, and contain...