Ecosystems and evolution

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Vitamins and minerals:

Vul de lege plekken in  

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Vitamins and

are an important part of an animal's diet, plants will also take them from the soil, the lack of a certain

has it's symptoms, for example scurvy, which occurs from a lack of vitamin C. Fibre is for example, an important part of our diet because it helps the right kinds of

grow. But the dissolving of most other chemical substances and allowing chemical reactions is done by



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