Food chains are made up of trophic levels. In a food chain there are 5 different trophic levels. They are:
Level 1 - Producers - plants
Level 2 - Primary consumers - Animals that eat only plants (Herbivores)
Level 3 - Secondary consumers - Animals that eat herbivores (Carnivores)
Level 4 - Tertiary consumers - Animals that eat carnivores (Carnivores)
Level 5 - Apex predators - Animals at the top of the food chain. Nothing eats these animals.
The below diagram shows 4 trophic levels of a Food chain. Producers, Primary consumers, Secondary consumers and Tertiary consumers
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