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They show how many on the first level are need to support the second level. And how many on the second level are need to support the third level. Notice that each level is smaller than the one below. There are always very few top predators.
Wiki User
∙ 8y ago
monique robles
to show that some food groups need to be eaten more than others
Wiki User
∙ 12y agoEach stripe's width is meant to reflect the relative quantity of that type of food you should eat. For example the grains stripe is wider because you should eat more grains that other foods.
Wiki User
∙ 12y agoThe wider the level, the more of that food group you should have in your diet.
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