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Energy and Activity ...
The energy in food is used to carry out all the activities that keep an organism alive. For example: moving, keeping warm or sensing changes in the world around it. The more active an animal or a plant is, the more energy it needs to stay alive.
Energy is measured in Joules or sometimes in calories. The table opposite shows how much energy a man uses when he is involved in different activities. You can see from this table that the activities that need the most effort also need most energy.
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© Paul Billiet and Shirley Burchill 2008 |
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