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Why is the sun considered the ultimate source of energy for life on earth?
a. all organisms carry out cellular respiration.
b. photosynthetic organisms provide energy for other organisms on earth.
c. the sun heats the earth's atmosphere
d. organisms carry out photosynthesis?

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b. photosynthetic organisms provide energy for other organisms on earth.

B is the most suitable answer as photosynthetic organisms get their energy from the sun, and other organisms get their energy from photosynthetic organisms, so the sun is the source of energy for all life.
E. From the energy of the sun plants changes light energy from the sun to chemical energy basically food by photosynthesis and animals eat plants and the chemical energy is used to do their activity