All organisms get their energy from either sunlight or chemical energy in food, with some like plants and algae tracing their energy source back to sunlight.
All organisms use a source of energy for their metabolic activities. Some organisms capture energy from the sun and convert it into chemical energy in food (such as grass and bacteria that can perform photosynthesis); others use chemical energy in molecules they take in as food.
Photoautotrophs like plants, algae, and certain bacteria use energy from sunlight to make food through photosynthesis. This process allows them to trace all the energy they use back to radiant energy from the Sun.
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