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Question
One of the early possible sources of energy was
One of the early possible sources of energy was
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Solution
The correct option is D UV rays and lightening
The first photosynthesizing organisms used UV light as an energy source, since there is more energy associated with short wavelength light than long wavelength light. This occurred about 3.5 billion years ago and the immediate by-product was the ozone layer, which blocks UV light. This resulted in the first mass extinction, the death of all UV photosynthesizing cells. Only organisms, which were able to utilize the visible portion of the spectrum survived. Thus, option D is correct.
The first photosynthesizing organisms used UV light as an energy source, since there is more energy associated with short wavelength light than long wavelength light. This occurred about 3.5 billion years ago and the immediate by-product was the ozone layer, which blocks UV light. This resulted in the first mass extinction, the death of all UV photosynthesizing cells. Only organisms, which were able to utilize the visible portion of the spectrum survived. Thus, option D is correct.
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