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Because of species. For example, some birds, eat some snakes, but half of the time, the snakes are poisonous or so, and again, some birds can detect the poison, some cant. I hope this helped.

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12y ago
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10y ago

If the first layer has 100 members, the second layer can only be 10% so 10 members can be supported, the last layer will be 10% of that or 1.

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Q: Why are food chains usually restricted to three or four trophic levels?
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