Each stage in a food chain or web is called a trophic (feeding) level
Producers (autotrophs, e.g. plants) occupy the first trophic level. They make their own food.
Primary consumers (herbivores or omnivores) occupy the next level- they eat producers.
Secondary consumers (carnivores and omnivores) occupy the next level- they eat consumers.
Tertiary consumers (top carnivores and omnivores) occupy the next level- they eat consumers.
Biomass (total mass of living matter) decreases at each trophic level e.g. a field of dandelions feeds a family of rabbits, which can all be scoffed one hungry fox.
Food chains show one way the energy from a producer is passed to a consumer.
Food webs show multiple food chains and demonstrate different ways energy flows through an ecosystem.
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