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external opening of the rectum (part of the mammalian digestive tract) through which faeces are expelled.
ground tissue with thin-walled cells that makes up most of the plant body. These cells are used...
the gamete-producing phase that produces the zygote from which the sporophyte emerges.
a type of nuclear division during which somatic cells divide into new cells for growth or to...
coiled nephron tubule that extends from the loop of Henlé to the collecting duct.
substances that have a harmful effect on the environment and also on human health.