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Trophic levels are the feeding position in a food chain such as primary producers, herbivore, primary carnivore, etc. Green plants form the first trophic level, the producers.
An ecological pyramid is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
The carbon cycle is based on carbon dioxide (CO2), which can be found in air in the gaseous form, and in water in dissolved form.