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animal wastes (particularly urine) that contain materials high in nitrogen.
a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...
external opening of the rectum (part of the mammalian digestive tract) through which faeces are...
epithelial tissue that lines the inner spaces of the body or organs.
small protrusions on the surface of mammalian teeth (premolars and molars), which help to grind...
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...