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external opening of the rectum (part of the mammalian digestive tract) through which faeces are expelled.
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
the tube that carries urine from the nephrons to the ureter via the renal pelvis.
animals with two cellular body wall layers: the ectoderm and endoderm.
pigments that occur in the brightly coloured, yellow, orange or red parts of the plant, such as...