The organic materials that remain after photosynthesis organisms in the ecosystem have used some of these compounds for their cellular energy needs called primary productivity.
Cellular respiration is defined as the process through which organisms combine oxygen with food molecules, converting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, water and carbon dioxide.
Common examples of primary producers include diatoms, coccolithophores and dinoflagellates.
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