Answers created by Elvi

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• Plants don't move around, so why do they need energy?
  
• Question #988c5
  
• How is the central nervous system protected from external and internal injury?
  
• Question #491b8
  
• Question #143c9
  
• Can you explain the hearing mechanism ?
  
• How does stress affect the male reproductive system?
  
• How do you draw the water cycle?
  
• How do organelles help cells survive?
  
• Which way does the Earth rotate and why?
  
• What are the steps of the phosphorus cycle?
  
• What is nuclear energy?
  
• What are the imortant characteristics of a pie chart?
  
• Question #d1b28
  
• Question #ee8ad