1) Respiration produces useful _ _ _ _ _ _ in the cells.
2) The main food substance that is used in respiration is _ _ _ _ _ _ _ 3) we get rid of carbon dioxide by _ _ _ _ _ _ _ _ _ it out.
4) If plants did not make _ _ _ _ _ _ gas we would soon use it all up.
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1. molecules 2. milk 3. releasing 4. carbon dioxide
Explanation:
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