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P1: Energy is neither created nor destroyed, but can be transformed from one form to another to generate biological activity
Light energy from the sun is used to drive the chemical reactions of photosynthesis which results in the production of glucose, which is an example of chemical energy. This glucose is used as a source of energy for animals.

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P4: Matter is recycled through the re-arrangement of chemical bonds in biological entities.
The Calvin Cycle is the second part of photosynthesis which fixes CO2 into glucose.

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P2: Input of energy, which can be from different sources, is needed to build and maintain biological entities.
Animals need chemical energy from the foods they eat to function. This is most commonly in the form of glucose and it is produced by plants via photosynthesis.