Multiple choice

Air supplies _______ and ______to crops and living beings.

  1. carbon and hydrogen

  2. <span style="font-family:" arial;="" font-size:="" small;="">carbon<span style="font-family:" arial;="" font-size:="" small;=""> and oxygen

  3. hydrogen and oxygen

  4. carbon, hydrogen and oxygen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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