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Eutrophication is the loss of oxygen in a body of water (e.g. pond or lake). This is usually due to algal bloom caused by artificial fertilisers and other chemicals being washed into the water by rain.The...

Muscle cells are present in the stomach wall so that they can contract and move the food. This aids digestion and the action of enzymes

The movement of molecules from an area of high concentration to low concentration across a membrane using energy.

Metabolic rate is the speed at which chemical reactions take place in our bodies

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