Imagine, what would happen if there were no producers?
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The ecosystem has three major biotic component. Producer, consumer and decomposer. They are interrelated and dependent on each other. Producers are the autotrophs which act as a source of food and energy for the consumers. If there where no produces, the consumers would die due to hunger and thus the other dependent trophic level will not survive and a time will come when they will be no life on earth.