A food chain is a group of organisms that eat one another, allowing energy and nutrients to flow from one to the next.
In ecostem, a food web is made up of all the food chains in one ecosystem. Every living thing in an ecosystem is a part of several food chains. Each food chain represents one possible path for energy and nutrients as they move through the ecosystem. A food web is made up of all of the interconnected and overlapping food chains in an ecosystem.
Many different food chains and trophic levels are linked by food webs. Food webs can support long and complicated food chains as well as very short ones.
For example, grass in a forest clearing uses photosynthesis to produce its own food. A rabbit consumes grass. The rabbit is devoured by a fox. When a fox dies, decomposers like worms and mushrooms decompose its body and return it to the soil, where it provides nutrients to plants like grass.
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