A student is setting up a model to study the carbon cycle and natural sources of carbon dioxide. They create a microenvironment that contains soil, leaf debris, an earthworm, heterotrophic bacteria, and a sun lamp. What natural source of carbon dioxide and major metabolic process was left out of the model?AThere is no representation of decomposition in the model environment.BThere is no representation of cellular respiration in the model environment.CThere is no representation of photosynthesis in the model environment.DThere is no representation of ingestion in the model environment.

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