Which of the following shows a modern technology measure that helps preserve and conserve the environment?

Q. Which of the following shows a modern technology measure that helps preserve and conserve the environment?

  1. The practising crop rotation
  2. The recycling of paper, plastics and metal cans
  3. Using machines in agricultural industry
  4. Converting industrial wastes into biogas

Answer: The recycling of paper, plastics and metal cans

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