why food chain generally consist 3 or 4 steps
As the food is passed through the food web, energy is lost. In general terms, only 10% of the energy stored in one trophic level (such as producers) is actually transferred to the next trophic level (for example the herbivores). This is known as the pyramid of energy. Eventually there is so little energy remaining in the top trophic level that no higher trophic level can be supported. This is why there are few if any fourth order consumers or higher in any ecosystem.
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