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Secondary consumers are consumers that consume primary consumers. They consist of carnivores and omnivores.
Rat
Decomposers include bacteria and fungi and detritivores. Bacteria and fungi consume by absorbing their food, while detritivores such as worms get their energy by eating dead and decaying organisms.
Squirrel
Primary Consumers
Fish
All consumers get their energy by consuming other organisms. Organisms that consume producers are called primary consumers, because they get their food from organisms in the first trophic level (producers).
Fungi
Bacteria
Worms
Grasshopper
Giraffe
Rabbit
The trophic levels represent the "feeding" levels of the ecosystem, or in other words, the energy flow through the ecosystem. In a typical ecosystem, only 10% of the energy consumed by the prior trophic level, and 90% of the energy is transferred or transformed into new energy. Energy in ecosystems are not lost, but instead changed into a new form of energy. Trophic levels can be displayed in many ways, but the most popular way is a pyramid. The main consumers are at the top, whereas the producers, since they have the most energy to start, are at the bottom. Here is an example:
Algae
Tree
Wheat
Producers are organisms that make their own food. These include plants and algae that use the energy of the sun to make their own food. These organisms are at the bottom of the energy pyramid in an ecosystem, because they can produce their own energy and have the most energy.
Red line=Where the type of organism shows up on the energy pyramid