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Basic English QUESTION #4441
Question 1
The availability of oxygen is an essential ____ for animal life, while carbon dioxide is equally ____ for plant life.
  • choice, optional
  • duplication, selective
  • luxury, harmful
  • None of these✔️
Correct Answer Explanation
Oxygen is essential for animals and CO2 is essential for plants. None of the paired options provide two synonyms for 'essential'.