Why do food chains have an infinite number of links?

Why do food chains have an infinite number of links?
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The base of the food chain determines the number of levels aboveit. The first level needs to use about 90% of the energy that theymake for themselves for growing and reproducing. That leaves 10%for the next level. That level uses 90% of that 10% for growth andreproduction. That means that only 1% of that can go up for thenext level to use. Only in a very few ecosystems (tropical rainforests or temperate rain forests) is there even enough anotherlevel.
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