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Energy pyramids are always slopping because less energy is transferred from each level than was paid into it. The plants and other green organisms produce the food for the web. But they need to use some of the energy for growth and for reproduction (90%).
That leaves about 10% for the next level. That level also needs energy for growth and reproduction, so that leaves 10% of that first 10% for the third level.
Since this works this way, each level is smaller and smaller. The number of species at each level competes for food with the others in that level.
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∙ 8y ago
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