science
Grade-5
Easy

Question

Most of the energy that fuels ecosystems on earth come from 

  1. Chemicals   
  2. Water
  3. Sunlight
  4. Bacteria

hintHint:

energy is related to heat and light

The correct answer is: Sunlight


    The only source of energy for all ecosystems on Earth is the sun. The radiant light and heat from the sun is the primary, source for most organisms and is used for the production of electricity, fuel, thermal energy, agriculture, etc.

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