Energy is needed to drive an ecosystem

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Energy is essential for driving ecosystems, with sunlight often identified as the primary source due to its role in photosynthesis and heating organisms. While sunlight (D) is a key energy source, the discussion acknowledges that some ecosystems, like those near hydrothermal vents, do not rely on it. Chemical bonds are highlighted as a fundamental element in all ecosystems, as they store energy that organisms utilize. Organic fuel, derived from the remains of living organisms, also connects back to solar energy through the process of fossilization. Overall, the conversation emphasizes the complexity of energy sources in ecosystems, with a particular focus on the significance of chemical bonds.
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Energy is needed to "drive" an ecosystem

Energy is needed to "drive" an ecosystem. What is the fundamental source of that energy?
A. Chemical Bonds
B. Heat
C. Organic Fuel
D. Sunlight

I am not sure about this question but I think the answer is D. Sunlight is this correct? And if so why ?
 
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This question requires a context. Or else if general, it requires a general knowledge of science. My thougt is solar energy is fundamental- it heats plants and animals, enables photosynthesis. When animals eat the plants, their enzymes break apart the chemical bonds obtaining heat or energy storage for themselves. Organic fuel is also general- if they mean fossil fuel, it is thought that living things die, are buried and treated with high temperature and pressure, becoming hydrocarbons. But all these trace back to solar heat.
 


Well, since there are some ecosystems that don't require sunlight, such as those around hydro-thermal vents, it seems to me that the common element in all ecosystems is chemical bonds.
 
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