In the food chain, a tiger has eaten a deer, the deer have eaten grass. The grass has grown out of the remains and decomposition of the tiger. That is a simple food chain. But in reality, such simple cycles are not the only thing. It is much more complex, also known as the food web. The food web, which has more complex cycles, can be like this: an Eagle has eaten a snake, which has eaten a frog, which has eaten a grasshopper. An eagle also can eat a dead fox, which has eaten a mouse, which has eaten a grasshopper. This picture above has a small depiction of the complex food web.
Food chains were invented by the Arab scientist and philosopher Al-Jahiz in the 10th century. Later Charles Elton introduced the food web concept in 1927
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