Answers created by Pepe

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• What are two events associated with the impact of a comet or an asteroid with Earth that would cause a major extinction of life?
  
• What is electricity?
  
• If we burn a piece of paper using a small flame of match stick, the flame, that is heat and light released from the reaction increases.where do these heat and light energies come from?(energy can be created)
  
• How is the central nervous system protected from injury?