Answer: 3.friction
Explanation: friction is a force of resistance acting between objects in contact and tending to dampen their motion
Answer: Sunlight
Explanation: Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
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It sounds like the answer would be B.