Answers created by Y.May

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• Hydrogen has how many outer-shell electrons?
  
• When the ocean absorbs #CO_2#, the pH of the ocean water rises. What's the effect of this process?
  
• How do we define biodiversity?
  
• What kind of temperature is typical of the tundra climate?
  
• What three elements are needed to start a fire?
  
• Which process removes carbon dioxide from the atmosphere?
  
• What group is iron in?
  
• What does the energy efficiency ratings on products mean?
  
• How does evolution work?
  
• On average what proportion of energy in a ecosystem is transferred from one trophic level to the next, and where does rest energy of the energy go?
  
• Where are the nephrons located?
  
• Is water an acid or a base?
  
• Why is the maximum size of an energy pyramid 5 levels?
  
• What are pros and cons of human cloning?
  
• What are the causes of erosion?
  
• How do humans affect the carbon cycle?
  
• What are the pros and cons of fossil fuels?
  
• What is the ionic charge of an ion with 18 protons and 15 electrons?
  
• How do you calculate the efficiency of energy transfer?