This is a simplified representation of the food web showing the main pathways. Food (energy) moves in the direction of the arrows. The driving force is sunlight. Depictions of the various organisms are not to scale. The food web is a simplified way of understanding the process by which organisms in higher trophic levels gain energy by consuming organisms at lower trophic levels. All energy in an ecosystem originates with the sun. 
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A food web consists of many food chains. A food chain only follows just one path as animals find food. eg: a hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. a food web shows the many different paths plants and animals are connected.
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good job aryan
thanks abhinav n u too