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the underground region which is saturated with ground water.

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the domain that contains prokaryotic micro-organisms. Some live in extreme environments, such as...

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simple connective tissue with a network of white, inelastic, collagen fibres and small, yellow,...

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the process whereby nutrients that have been absorbed from the digestive system are taken up by...

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an allergic reaction that triggers the immune system causing constriction and inflammation of...

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