Answers edited by Jess the bee

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• Are modern birds reptiles?
  
• Why are gradients important in diffusion and osmosis?
  
• What is a hot, dry biome called?
  
• Thoughts on the recent announcement made about the future of the Socratic website? Share them here!
  
• What are the ethical issues with the following? : (a) GM foods (b) Animal cloning
  
• Why are frogs commonly used in laboratory dissections?