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(A) The ultimate source of energy for almost all ecosystems on Earth is sunlight.Solar energy is captured by producers (plants,algae,and cyanobacteria

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Sunlight

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(A) The ultimate source of energy for almost all ecosystems on Earth is sunlight.Solar energy is captured by producers (plants,algae,and cyanobacteria) through the process of photosynthesis and converted into chemical energy.While deep-sea hydrothermal vent ecosystems derive energy from chemical reactions (chemosynthesis) rather than sunlight,for the vast majority of ecosystems,the Sun remains the primary and ultimate energy source.

What is the ultimate source of energy for the ecosystems?

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