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liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the cells and large proteins found in blood plasma.
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for...
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
the digestive tract of an animal, made up of different organs, that extends from the mouth to...
series of interlinked food chains by which energy circulates within an ecosystem.