The Sun is the only source of energy for all ecosystems on Earth except for:

Deep sea hydro-thermal ecosystem

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Freshly formed rain water pond

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Forest ecosystem

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Alpine tundra ecosystem

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Solution

The correct option is A Deep sea hydro-thermal ecosystem
The Sun is the only source of energy for all ecosystems on Earth except for deep sea hydro-thermal ecosystem. In deep sea hydro-thermal ecosystem, sunlight cannot penetrate and hence chemical deposits and hydrothermal fluids are the source of energy for the organisms habitat in this ecoystem.

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