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specialised proteins which catalyse chemical reactions and thereby speed up chemical reactions...

a poem on a grand scale, telling of heroes and of a nationâ??s great exploits, e.g. The Odyssey...

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the point on the Earth's surface above the focus of an earthquake

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the outer most layer of tightly packed modified parenchyma cells in plants.

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the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...

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