Multiple choice

The __________ is the main source of energy for most living things.

  1. electricity

  2. respiration

  3. sun

  4. photosynthesis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sun is the ultimate source of energy for almost all ecosystems on Earth. Producers capture solar energy through photosynthesis, which is then passed along the food chain to consumers and decomposers.

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