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One of the possible early sources of energy was/were-
a. $C{O_2}$
b. Chlorophyll
c. Green plants
d. UV rays and lightning

Last updated date: 13th Jun 2024
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Hint: The very first requiring synthetic processes that occurred on primitive earth was obtained from the energy of the sun, along with violent electric discharges like lightning, and the heat produced from volcanic eruptions as well as ionizing radiations like X-rays.

Complete answer:
Option- A- $C{O_2}$ – latest studies from NASA has stated that with the new development of technology now we can convert the greenhouse gas carbon dioxide that is $C{O_2}$ into fuel by the process of solar-powered and thin-film devices. The metal oxide thin film is fabricated to convert into a photoelectron chemical cell that is said to be powered by the sun or solar energy.
Option- B- CHLOROPHYLL- the Green substance present in plant producers and traps light energy from the sun, which is further used to combine carbon dioxide along with water into sugars as their food. This process is commonly known as photosynthesis. Chlorophyll is a vital part of the photosynthesis process, as it works as an energy source for the plant from sunlight.
Option – C – GREEN PLANTS - Experiments and studies have proven that green plants can serve as a source of clean and renewable energy.
Option – D – UV RAYS AND LIGHTING - UV radiation is present in sunlight, as well as constitutes about 10% of the total electromagnetic radiation output from the Sunlight. They are also produced by electric arcs along with specialized lights, such as mercury-vapour lamps, tanning lamps, and black lights etc.

The right answer is – option – D – UV RAYS AND LIGHTING

Note: Among all the energy sources used by nature the early were UV radiation, intermittent lightning ionizing radiation as well as even thermal energy. Before the development of earth there were no scientific researches and experiments which can bring the artificial energy sources to existence so we were totally dependent on nature for all our needs.