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liquid waste material that is discharged into a river or the sea.
(also called elimination or defecation) the process whereby undigested food remains are expelled...
(also called yellow cartilage) type of cartilage that contains many yellow elastic fibres lying...
microscopes that do not rely on light to produce images. They are used to study the internal...
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
in plants: the structure within a seed that will develop into the new plant.
irreversible disease where the alveoli are damaged, resulting in breathing difficulties.
the separation of large fat molecules into smaller drops for easy digestion.
extremely hard, calcium-rich substance which covers the crown of the tooth.