The source of energy available for chemosynthesis of life was

Sunlight

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UV rays and lightening

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Hydrostatic pressure of sea water

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All of the above

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Solution

The correct option is B UV rays and lightening
Chemosynthesis is a process in which some microorganisms obtain energy from chemical reactions to produce food. The bacteria which performs this process is called as chemosynthetic bacteria. In primitive earth, chemosynthetic bacteria used UV rays, lightening and volcanic activity and anaerobic conditions to obtain energy for their subsistence.
Thus, the correct answer is option B.

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