Explain why it is possible for photosynthetic and chemosynthetic bacteria to co-exist in an oxygen free environment

Explain why it is possible for photosynthetic and chemosynthetic bacteria to co-exist in an oxygen free environment.

Photosynthetic bacteria release oxygen during photosynthesis, which they both use in respiration. They also produce organic compounds which are used by the chemosynthetic bacteria for metabolism.

Chemosynthetic bacteria produce inorganic substrate like hydrogen sulphide which are used by the photosynthetic bacteria in their metabolism.

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