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the development of a distinct head, with a concentration of nervous tissue and sense receptors...

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the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...

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chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.

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breaking down of large nutrient molecules using chemical means (e.g. through the action of...

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a form of potential energy stored in chemical bonds and released in a chemical reaction.

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