Chemosynthesis is the production of energy from biological and chemical means. Sunlight is not the source of the energy in chemosynthesis. Thus, option D is correct.
What is chemosynthesis?
Chemosynthesis is the process by which the living cells make organic compounds and other energy-producing compounds by the involvement of inorganic reactions.
The process of chemosynthesis does not require sunlight, unlike the photosynthesis that has been producing energy through it. The microorganism usually uses this process to make food like glucose to drive the metabolic reactions.
The chemosynthesis reaction uses ammonia, sulfide, methane, etc. to produce organic compounds that provide the energy needed by the cell.
Therefore, sunlight is not needed in chemosynthesis.
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