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Exchange of Material

Plants and animals need to obtain things from their enviroment and release things into it.

Plants- In- carbon dioxide- out- oxygen,water vapour  

Animals- In-oxygen water food-Out- co2 water and urea

very small organisms can exchange materials with the enviroment by diffuision through their body surface

surface area : volume ratio

Large organisms have specialised exchange surfaces to compensate for their low surface area.

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