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liquid waste material that is discharged into a river or the sea.
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
specialised proteins which catalyse chemical reactions and thereby speed up chemical reactions...
when an animal accumulates body fat or stores food resources during warmer periods and becomes...
tissue that binds organ components and organs together and supports structures of the body.
membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the...