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breaking down of large nutrient molecules using chemical means (e.g. through the action of enzymes) into smaller soluble molecules that can be absorbed by the body.
the main vein that returns deoxygenated blood from the lower parts of the body to the right...
a form of potential energy stored in chemical bonds and released in a chemical reaction.
external opening of the rectum (part of the mammalian digestive tract) through which faeces are...
those species that are found only in a particular area or region and nowhere else on Earth.
cellular respiration that takes place in the presence of free oxygen.