The various links or steps in a food chain at which the transfer of food and energy takes place are called trophic levels.
The producers form the first trophic level as they manufacture food. The
primary consumers form the second trophic level, the secondary
consumers form the third, and the tertiary consumers form the fourth
Grass is the producer which is eaten by the
grasshooper known as primary consumer. Then the grasshooper is eaten by
shrew, secondary consumer and lastly shrew eaten up by owl, tertiary
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