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  • What is the ultimate source of energy for all ecosystems?

  • What is the ultimate source of energy for all ecosystems? The sun is the biggest and natural source of energy, providing it in the form of light to autotrophs like green plants, which will produce food by photosynthesis.

  • What is the main source of energy in a food chain?

  • The sun is the biggest and natural source of energy, providing it in the form of light to autotrophs like green plants, which will produce food by photosynthesis. The energy then is transferred to secondary consumers by eating those plants, and that energy is again transferred again to tertiary consumers by eating those secondary consumers.

  • What is the main source of energy for autotrophs?

  • The sun is the biggest and natural source of energy, providing it in the form of light to autotrophs like green plants, which will produce food by photosynthesis.

  • Why do living things need energy to live?

  • Living things need energy to grow, breathe, reproduce, and move. Energy cannot be created from nothing, so it must be transferred through the ecosystem. The primary source of energy for almost every ecosystem on Earth is the sun.

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