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<p>of a keystone species could destroy the balance of the entire food chain.</p>

<p>The efficiency of a food chain depends on the energy first consumed by the primary producers. This energy then moves through the trophic levels.</p>

<p><big> History </big></p>
<p>Food chains were first discussed by <a href="page.php?w=al-Jahiz">al-Jahiz</a>, a 10th century Arab philosopher. The modern concepts of food chains and food webs were introduced by <a href="page.php?w=Charles_Sutherland_Elton">Charles Elton</a>.</p>

<p><big> Food chain versus food web </big></p>
<p>A</p><p>
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